RHSA-2026:26409
Vulnerability from csaf_redhat - Published: 2026-06-16 16:53 - Updated: 2026-10-13 00:54Summary
Red Hat Security Advisory: gnutls security update
Severity
Important
Notes
Topic: An update for gnutls is now available for Red Hat Enterprise Linux 10.0 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.
Security Fix(es):
* gnutls: gnutls: Security bypass allows acceptance of revoked server certificates via crafted OCSP response (CVE-2026-3832)
* gnutls: GnuTLS: Policy bypass due to case-sensitive nameConstraints comparison (CVE-2026-3833)
* gnutls: GnuTLS: Denial of Service via DTLS zero-length fragment (CVE-2026-33845)
* gnutls: GnuTLS: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly (CVE-2026-33846)
* gnutls: Fix qsort comparator in DTLS reassembly (CVE-2026-42009)
* gnutls: gnutls: Authentication Bypass via NUL Character in Username (CVE-2026-42010)
* gnutls: gnutls: Security bypass due to incorrect name constraint handling (CVE-2026-42011)
* gnutls: gnutls: Certificate validation bypass due to improper handling of URI and SRV SANs (CVE-2026-42012)
* gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name (CVE-2026-42013)
* gnutls: gnutls: Information disclosure via heap overread in RSA key exchange (CVE-2026-5260)
* gnutls: Fix use-after-free in gnutls_pkcs11_token_set_pin (CVE-2026-42014)
* gnutls: gnutls: Memory corruption due to off-by-one error in PKCS#12 bag handling (CVE-2026-42015)
* guntls: gnutls: Information disclosure via timing side-channel in PKCS#7 padding removal (CVE-2026-5419)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted Online Certificate Status Protocol (OCSP) response during a TLS handshake. Due to a logic error in how gnutls processes multi-record OCSP responses, a client with OCSP verification enabled may incorrectly accept a revoked server certificate, potentially leading to a compromise of trust.
CWE-179 - Incorrect Behavior Order: Early ValidationAffected products
Fixed
57 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-devel-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-devel-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-devel-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-devel-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-fips-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-fips-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-fips-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-fips-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-0:3.8.9-9.el10_0.19.src | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
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Known not affected
8 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
Workaround
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
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Threats
Impact
Low
A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `nameConstraints` labels, specifically for `dNSName` (DNS) or `rfc822Name` (email) constraints within `excludedSubtrees` or `permittedSubtrees`. A remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure.
6.5 (Medium)
Affected products
Fixed
57 products, the same list as for
CVE-2026-3832
Known not affected
8 products, the same list as for
CVE-2026-3832
Threats
Impact
Moderate
A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corruption vulnerability could lead to information disclosure.
8.2 (High)
Affected products
Fixed
57 products, the same list as for
CVE-2026-3832
Known not affected
8 products, the same list as for
CVE-2026-3832
Threats
Impact
Moderate
A flaw was found in gnutls. The PKCS#7 padding check, performed during decryption, was not constant-time. This timing side-channel could allow a remote attacker to potentially leak sensitive information about the padding bytes through observable timing differences. This vulnerability is a form of information disclosure.
CWE-208 - Observable Timing DiscrepancyAffected products
Fixed
57 products, the same list as for
CVE-2026-3832
Known not affected
8 products, the same list as for
CVE-2026-3832
Threats
Impact
Low
A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information disclosure or denial of service.
7.5 (High)
Affected products
Fixed
57 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-0:3.8.9-9.el10_0.19.aarch64 | — |
Vendor Fix
fix
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-0:3.8.9-9.el10_0.19.ppc64le | — |
Vendor Fix
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-devel-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-devel-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-devel-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-devel-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-fips-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-fips-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-fips-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-fips-0:3.8.9-9.el10_0.19.x86_64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-0:3.8.9-9.el10_0.19.aarch64 | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-0:3.8.9-9.el10_0.19.ppc64le | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-0:3.8.9-9.el10_0.19.s390x | — |
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| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-0:3.8.9-9.el10_0.19.x86_64 | — |
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Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-0:3.8.9-9.el10_0.19.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-0:3.8.9-9.el10_0.19.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-0:3.8.9-9.el10_0.19.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-0:3.8.9-9.el10_0.19.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-0:3.8.9-9.el10_0.19.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-c++-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-debugsource-0:3.8.9-9.el10_0.19.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-utils-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
Vendor Fix
fix
Workaround
|
Known not affected
8 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
Workaround
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.aarch64 | — |
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.ppc64le | — |
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.s390x | — |
Workaround
|
|
| Unresolved product id: BaseOS-10.0.Z.E2S:gnutls-dane-debuginfo-0:3.8.9-9.el10_0.19.x86_64 | — |
Workaround
|
Threats
Impact
Important
A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The issue arises in merge_handshake_packet() where incoming handshake fragments are matched and merged based solely on handshake type, without validating that the message_length field remains consistent across all fragments of the same logical message. An attacker can exploit this by sending crafted DTLS fragments with conflicting message_length values, causing the implementation to allocate a buffer based on a smaller initial fragment and subsequently write beyond its bounds using larger, inconsistent fragments. Because the merge operation does not enforce proper bounds checking against the allocated buffer size, this results in an out-of-bounds write on the heap. The vulnerability is remotely exploitable without authentication via the DTLS handshake path and can lead to application crashes or potential memory corruption.
7.5 (High)
Affected products
Fixed
57 products, the same list as for
CVE-2026-3832
Known not affected
8 products, the same list as for
CVE-2026-3832
Threats
Impact
Important
A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets with duplicate sequence numbers. This could lead to unstable packet ordering or undefined behavior, resulting in a denial of service.
7.5 (High)
Affected products
Fixed
57 products, the same list as for
CVE-2026-3832
Known not affected
8 products, the same list as for
CVE-2026-3832
Threats
Impact
Important
A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.
7.1 (High)
Affected products
Fixed
57 products, the same list as for
CVE-2026-3832
Known not affected
8 products, the same list as for
CVE-2026-3832
Threats
Impact
Important
A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.
7.4 (High)
Affected products
Fixed
57 products, the same list as for
CVE-2026-3832
Known not affected
8 products, the same list as for
CVE-2026-3832
Threats
Impact
Moderate
A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.
7.1 (High)
Affected products
Fixed
57 products, the same list as for
CVE-2026-3832
Known not affected
8 products, the same list as for
CVE-2026-3832
Threats
Impact
Moderate
A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.
8.2 (High)
Affected products
Fixed
57 products, the same list as for
CVE-2026-3832
Known not affected
8 products, the same list as for
CVE-2026-3832
Threats
Impact
Moderate
A flaw was found in GnuTLS. The `gnutls_pkcs11_token_set_pin` function, used for changing the Security Officer PIN, can lead to a use-after-free vulnerability. This occurs when an attacker attempts to change the PIN with a NULL old PIN for a token that lacks a protected authentication path.
6.6 (Medium)
Affected products
Fixed
57 products, the same list as for
CVE-2026-3832
Known not affected
8 products, the same list as for
CVE-2026-3832
Threats
Impact
Moderate
A flaw was found in gnutls. An off-by-one error exists in the PKCS#12 bag element bounds check. This vulnerability allows an remote attacker to write past the internal array of a PKCS#12 bag when appending to a bag that already contains 32 elements. This memory corruption could lead to a denial of service (DoS) or potentially other unspecified impacts.
5.3 (Medium)
Affected products
Fixed
57 products, the same list as for
CVE-2026-3832
Known not affected
8 products, the same list as for
CVE-2026-3832
Threats
Impact
Moderate
References
80 references
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"text": "This issue has a LOW impact. A flaw in gnutls\u0027 OCSP stapling implementation allows a client with OCSP verification enabled to accept a revoked server certificate. This occurs when a multi-record OCSP response is stapled, and the client incorrectly reads the certificate status from an unrelated record, leading to an order-dependent acceptance of a revoked certificate.",
"title": "Statement"
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:26409"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.7,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
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{
"category": "impact",
"details": "Low"
}
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"title": "gnutls: gnutls: Security bypass allows acceptance of revoked server certificates via crafted OCSP response"
},
{
"cve": "CVE-2026-3833",
"cwe": {
"id": "CWE-178",
"name": "Improper Handling of Case Sensitivity"
},
"discovery_date": "2026-03-09T14:02:09.783000+00:00",
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{
"system_name": "Red Hat Bugzilla ID",
"text": "2445763"
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{
"category": "description",
"text": "A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `nameConstraints` labels, specifically for `dNSName` (DNS) or `rfc822Name` (email) constraints within `excludedSubtrees` or `permittedSubtrees`. A remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: GnuTLS: Policy bypass due to case-sensitive nameConstraints comparison",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue is particularly important because it affects the correct enforcement of X.509 nameConstraints, which are specifically designed to limit the authority of subordinate CAs. In GnuTLS, the use of case-sensitive comparisons (memcmp) for dNSName and the domain portion of rfc822Name violates the case-insensitive matching requirements defined in RFC 5280 and RFC 4343. As a result, a constrained subordinate CA can bypass excludedSubtrees or permittedSubtrees restrictions simply by changing the letter casing of a domain in the SAN (e.g., ExAmPlE.CoM vs example.com). Since nameConstraints are often the only mechanism enforcing domain boundaries in delegated PKI hierarchies, this flaw effectively allows a malicious or compromised sub-CA to issue certificates for domains that should be cryptographically prohibited, enabling unauthorized certificate validation and potential TLS impersonation of restricted services.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"category": "external",
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{
"category": "external",
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},
{
"category": "external",
"summary": "https://gitlab.com/gnutls/gnutls/-/issues/1803",
"url": "https://gitlab.com/gnutls/gnutls/-/issues/1803"
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
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"details": "Moderate"
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"title": "gnutls: GnuTLS: Policy bypass due to case-sensitive nameConstraints comparison"
},
{
"acknowledgments": [
{
"names": [
"Joshua Rogers"
],
"organization": "AISLE Research Team"
}
],
"cve": "CVE-2026-5260",
"cwe": {
"id": "CWE-126",
"name": "Buffer Over-read"
},
"discovery_date": "2026-05-06T19:50:31.302000+00:00",
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{
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467450"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corruption vulnerability could lead to information disclosure.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Information disclosure via heap overread in RSA key exchange",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Product Security rates this vulnerability as Moderate severity because exploitation requires a specialized server setup where RSA key exchange is negotiated using a private key hosted on a PKCS#11 token. In standard Red Hat Enterprise Linux deployments, system-wide crypto policies prioritize forward-secret (EC)DHE cipher suites, and PKCS#11 hardware tokens are not configured by default. Furthermore, the issue only triggers a bounded heap overread, resulting in limited information disclosure rather than arbitrary code execution.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-5260"
},
{
"category": "external",
"summary": "RHBZ#2467450",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467450"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-5260",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-5260"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-5260",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5260"
},
{
"category": "external",
"summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-10",
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-10"
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],
"release_date": "2026-04-29T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2026-06-16T16:53:26+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "gnutls: gnutls: Information disclosure via heap overread in RSA key exchange"
},
{
"acknowledgments": [
{
"names": [
"Doria Tang"
],
"organization": "Stony Brook University"
}
],
"cve": "CVE-2026-5419",
"cwe": {
"id": "CWE-208",
"name": "Observable Timing Discrepancy"
},
"discovery_date": "2026-05-07T11:02:44.331000+00:00",
"flags": [
{
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467686"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in gnutls. The PKCS#7 padding check, performed during decryption, was not constant-time. This timing side-channel could allow a remote attacker to potentially leak sensitive information about the padding bytes through observable timing differences. This vulnerability is a form of information disclosure.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Information disclosure via timing side-channel in PKCS#7 padding removal",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated with a Low severity impact because exploiting timing side-channels in cryptographic operations over a network requires precise measurement capabilities, extensive request volume, and low network jitter. While applications linking against GnuTLS to process encrypted PKCS#7 payloads are exposed to subtle processing time variances, successful extraction of plaintext padding or message content in typical Red Hat environments remains computationally complex and technically difficult to execute reliably.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-5419"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-5419",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5419"
},
{
"category": "external",
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{
"category": "vendor_fix",
"date": "2026-06-16T16:53:26+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
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"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.7,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
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"title": "gnutls: gnutls: Information disclosure via timing side-channel in PKCS#7 padding removal"
},
{
"cve": "CVE-2026-33845",
"cwe": {
"id": "CWE-191",
"name": "Integer Underflow (Wrap or Wraparound)"
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"discovery_date": "2026-03-24T05:35:59.740000+00:00",
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2450624"
}
],
"notes": [
{
"category": "description",
"text": "A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information disclosure or denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: GnuTLS: Denial of Service via DTLS zero-length fragment",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue marked as Important severity due to its remote, pre-authentication reachability and its impact on a critical DTLS handshake parsing path. The vulnerability can be triggered by an unauthenticated attacker sending crafted DTLS handshake fragments, requiring no prior access or interaction. It leads to an out-of-bounds read caused by an integer underflow in fragment reassembly, operating entirely on attacker-controlled input. Such flaws in low-level protocol parsing are particularly serious, as they may result in disclosure of sensitive process memory, including cryptographic or session-related data, and can also cause reliable application crashes leading to denial of service. Given that DTLS is commonly used in network-facing services such as VPNs and real-time communication systems, the exposure surface is broad. The combination of unauthenticated remote exploitation, memory safety violation, and potential confidentiality and availability impact justifies classifying this issue as high severity rather than moderate.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-33845"
},
{
"category": "external",
"summary": "RHBZ#2450624",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450624"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-33845",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-33845"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33845",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33845"
}
],
"release_date": "2026-04-30T17:28:41.473000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-16T16:53:26+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"title": "gnutls: GnuTLS: Denial of Service via DTLS zero-length fragment"
},
{
"cve": "CVE-2026-33846",
"cwe": {
"id": "CWE-130",
"name": "Improper Handling of Length Parameter Inconsistency"
},
"discovery_date": "2026-03-24T05:38:09.899000+00:00",
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2450625"
}
],
"notes": [
{
"category": "description",
"text": "A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The issue arises in merge_handshake_packet() where incoming handshake fragments are matched and merged based solely on handshake type, without validating that the message_length field remains consistent across all fragments of the same logical message. An attacker can exploit this by sending crafted DTLS fragments with conflicting message_length values, causing the implementation to allocate a buffer based on a smaller initial fragment and subsequently write beyond its bounds using larger, inconsistent fragments. Because the merge operation does not enforce proper bounds checking against the allocated buffer size, this results in an out-of-bounds write on the heap. The vulnerability is remotely exploitable without authentication via the DTLS handshake path and can lead to application crashes or potential memory corruption.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: GnuTLS: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability should be classified as an important flaw rather than moderate because it exposes a pre-authentication, remotely reachable heap buffer overflow in the DTLS handshake processing path, which is part of the core protocol handling logic and commonly exposed in network-facing services. The flaw enables an attacker to inject controlled data at attacker-chosen offsets and sizes beyond allocated heap boundaries by exploiting inconsistent message_length handling across fragments, effectively creating a constrained but meaningful heap write primitive. Unlike benign memory safety bugs, this condition is deterministically triggerable with a small number of crafted packets and no environmental dependencies for denial-of-service, and it targets a long-lived parsing state where memory corruption can affect adjacent heap structures. Even if reliable code execution requires additional heap manipulation or layout knowledge, the combination of remote reachability, lack of authentication, controlled memory corruption capability, and trivial crashability significantly elevates the risk profile beyond moderate severity. In real-world deployments, such primitives are often sufficient to enable heap grooming and exploitation chains, particularly in services that repeatedly process attacker-controlled input, making this a materially important security flaw.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-33846"
},
{
"category": "external",
"summary": "RHBZ#2450625",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450625"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-33846",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-33846"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33846",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33846"
}
],
"release_date": "2026-05-04T08:53:59.249000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-16T16:53:26+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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{
"category": "impact",
"details": "Important"
}
],
"title": "gnutls: GnuTLS: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly"
},
{
"acknowledgments": [
{
"names": [
"Joshua Rogers"
],
"organization": "AISLE Research Team"
}
],
"cve": "CVE-2026-42009",
"cwe": {
"id": "CWE-475",
"name": "Undefined Behavior for Input to API"
},
"discovery_date": "2026-05-06T16:32:32.382000+00:00",
"flags": [
{
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467279"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets with duplicate sequence numbers. This could lead to unstable packet ordering or undefined behavior, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as an Important impact because an unauthenticated remote attacker can cause a denial of service without requiring user interaction or elevated privileges. The defect specifically resides in the datagram reordering logic of GnuTLS, leaving standard TCP-based TLS services unaffected across Red Hat environments. Systems are only exposed if they run network services configured to process untrusted Datagram Transport Layer Security (DTLS) handshakes.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-42009"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42009",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42009"
},
{
"category": "external",
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{
"category": "vendor_fix",
"date": "2026-06-16T16:53:26+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"details": "Important"
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],
"title": "gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability"
},
{
"acknowledgments": [
{
"names": [
"Joshua Rogers"
],
"organization": "AISLE Research Team"
}
],
"cve": "CVE-2026-42010",
"cwe": {
"id": "CWE-170",
"name": "Improper Null Termination"
},
"discovery_date": "2026-05-06T16:57:37.044000+00:00",
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467289"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest\u2013Shamir\u2013Adleman \u2013 Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Authentication Bypass via NUL Character in Username",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as an Important severity flaw because an unauthenticated remote attacker could circumvent authentication mechanisms on exposed TLS endpoints, compromising access control and potentially gaining unauthorized access. Exploitation requires servers to be explicitly set up with RSA Pre-Shared Key (RSA-PSK) key exchange, which is an uncommon configuration that is not enabled by default across standard Red Hat deployments. Deployments utilizing standard certificate-based authentication or public key infrastructure remain unaffected by this issue.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-42010"
},
{
"category": "external",
"summary": "RHBZ#2467289",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467289"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-42010",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42010"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42010",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42010"
},
{
"category": "external",
"summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-4",
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-4"
}
],
"release_date": "2026-04-29T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-16T16:53:26+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
"cvss_v3": {
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"attackVector": "NETWORK",
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"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
"version": "3.1"
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"title": "gnutls: gnutls: Authentication Bypass via NUL Character in Username"
},
{
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{
"names": [
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],
"organization": "Stella"
}
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"name": "Improper Certificate Validation"
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{
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"text": "A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Security bypass due to incorrect name constraint handling",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-42011"
},
{
"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467437"
},
{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-42011"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42011",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42011"
},
{
"category": "external",
"summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-6",
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-6"
}
],
"release_date": "2026-04-29T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-16T16:53:26+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
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"baseScore": 7.4,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
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"title": "gnutls: gnutls: Security bypass due to incorrect name constraint handling"
},
{
"acknowledgments": [
{
"names": [
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],
"organization": "1Seal"
}
],
"cve": "CVE-2026-42012",
"cwe": {
"id": "CWE-295",
"name": "Improper Certificate Validation"
},
"discovery_date": "2026-05-06T19:16:02.753000+00:00",
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"ids": [
{
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"text": "2467441"
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{
"category": "description",
"text": "A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Certificate validation bypass due to improper handling of URI and SRV SANs",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as Moderate severity because exploitation requires an active man-in-the-middle position or tricking a client into connecting to a rogue endpoint, along with obtaining a validly signed certificate containing specialized SAN fields. While GnuTLS is widely deployed across Red Hat products as a core cryptographic library, the impact is limited to hostname verification spoofing under specific certificate configurations. The issue does not permit remote code execution or direct compromise of the underlying system.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-42012"
},
{
"category": "external",
"summary": "RHBZ#2467441",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467441"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-42012",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42012"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42012",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42012"
},
{
"category": "external",
"summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-7",
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-7"
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"release_date": "2026-04-29T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2026-06-16T16:53:26+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "gnutls: gnutls: Certificate validation bypass due to improper handling of URI and SRV SANs"
},
{
"acknowledgments": [
{
"names": [
"Haruto Kimura"
],
"organization": "Stella"
},
{
"names": [
"Joshua Rogers"
],
"organization": "AISLE Research Team"
}
],
"cve": "CVE-2026-42013",
"cwe": {
"id": "CWE-295",
"name": "Improper Certificate Validation"
},
"discovery_date": "2026-05-06T19:47:00.134000+00:00",
"flags": [
{
"label": "vulnerable_code_not_present",
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467448"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as having a Moderate impact across affected Red Hat products because successful exploitation requires an active man-in-the-middle network position as well as a certificate issued by a trusted authority matching the target hostname\u0027s Common Name. Although TLS clients using GnuTLS on Red Hat Enterprise Linux and OpenShift are susceptible to improper certificate acceptance under these conditions, modern certificate authorities rarely issue certificates that omit valid Subject Alternative Names, substantially restricting practical threat vectors. Applications functioning exclusively as TLS servers or utilizing alternative cryptographic libraries like OpenSSL are not exposed to this flaw.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-42013"
},
{
"category": "external",
"summary": "RHBZ#2467448",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467448"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-42013",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42013"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42013",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42013"
},
{
"category": "external",
"summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-8",
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-8"
}
],
"release_date": "2026-04-29T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-16T16:53:26+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
"version": "3.1"
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{
"category": "impact",
"details": "Moderate"
}
],
"title": "gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name"
},
{
"acknowledgments": [
{
"names": [
"Luigino Camastra"
]
},
{
"names": [
"Joshua Rogers"
],
"organization": "AISLE Research Team"
}
],
"cve": "CVE-2026-42014",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2026-05-06T19:51:54.069000+00:00",
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{
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"text": "2467451"
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{
"category": "description",
"text": "A flaw was found in GnuTLS. The `gnutls_pkcs11_token_set_pin` function, used for changing the Security Officer PIN, can lead to a use-after-free vulnerability. This occurs when an attacker attempts to change the PIN with a NULL old PIN for a token that lacks a protected authentication path.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Use-after-free in gnutls_pkcs11_token_set_pin",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as having a Moderate impact because exploitation requires local access and is confined to administrative token maintenance routines, primarily resulting in application crashes. While GnuTLS is broadly deployed across Red Hat Enterprise Linux, the vulnerable code path is only triggered when managing PKCS#11 hardware tokens or smart cards lacking a protected authentication mechanism. Standard TLS client and server network communications across Red Hat products are not affected by this flaw.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
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{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42014"
},
{
"category": "external",
"summary": "https://gitlab.com/gnutls/gnutls/-/issues/1766",
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{
"category": "vendor_fix",
"date": "2026-06-16T16:53:26+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"attackVector": "LOCAL",
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"baseScore": 6.6,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H",
"version": "3.1"
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"details": "Moderate"
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"title": "gnutls: gnutls: Use-after-free in gnutls_pkcs11_token_set_pin"
},
{
"acknowledgments": [
{
"names": [
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]
}
],
"cve": "CVE-2026-42015",
"cwe": {
"id": "CWE-193",
"name": "Off-by-one Error"
},
"discovery_date": "2026-05-07T10:50:28.379000+00:00",
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2467678"
}
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"notes": [
{
"category": "description",
"text": "A flaw was found in gnutls. An off-by-one error exists in the PKCS#12 bag element bounds check. This vulnerability allows an remote attacker to write past the internal array of a PKCS#12 bag when appending to a bag that already contains 32 elements. This memory corruption could lead to a denial of service (DoS) or potentially other unspecified impacts.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "gnutls: gnutls: Memory corruption due to off-by-one error in PKCS#12 bag handling",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as Moderate impact because triggering the out-of-bounds write requires an application to parse or manipulate specially crafted PKCS#12 containers containing multiple bag elements, primarily resulting in a denial of service. Standard TLS network handshakes on Red Hat Enterprise Linux do not process PKCS#12 files by default. Consequently, only workloads or administrative tools configured to import or inspect untrusted certificate packages are exposed to potential memory corruption or crashes.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-42015"
},
{
"category": "external",
"summary": "RHBZ#2467678",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467678"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-42015",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42015"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42015",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42015"
},
{
"category": "external",
"summary": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-11",
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-11"
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"release_date": "2026-04-29T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2026-06-16T16:53:26+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "gnutls: gnutls: Memory corruption due to off-by-one error in PKCS#12 bag handling"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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