Affected: AlmaLinux:8: gnutls, AlmaLinux:8: gnutls-c++, AlmaLinux:8: gnutls-dane, AlmaLinux:8: gnutls-devel, AlmaLinux:8: gnutls-utils

Please update the gnutls packages to provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.

Security Fix(es):

* gnutls: Add more checks to DTLS reassembly (CVE-2026-33846) * gnutls: Fix qsort comparator in DTLS reassembly (CVE-2026-42009) * gnutls: Fix crashing on an underflow with a DTLS datagram (CVE-2026-33845) * gnutls: Fix RSA-PSK identity truncation (CVE-2026-42010) * gnutls: Fix case-sensitivity of domain name comparison in name constraints (CVE-2026-3833) * gnutls: Fix intersecting empty constraints (CVE-2026-42011)

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.

Affected: Alpaquita:23: gnutls, Alpaquita:25: gnutls, Alpaquita:stream: gnutls

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.

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.

Affected: openEuler:24.03-LTS-SP3: gnutls, openEuler:20.03-LTS-SP4: gnutls, openEuler:22.03-LTS-SP4: gnutls, openEuler:24.03-LTS: gnutls, openEuler:24.03-LTS-SP1: gnutls

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. It provides a simple C language application programming interface (API) to access the secure communications protocols as well as APIs to parse and write X.509, PKCS #12, and other required structures. The project strives to provide a secure communications back-end, simple to use and integrated with the rest of the base Linux libraries. A back-end designed to work and be secure out of the box, keeping the complexity of TLS and PKI out of application code. Security Fix(es):

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.(CVE-2026-33845)

gnutls-3.8.13-1.1 on GA media

gnutls: gnutls: Security bypass allows acceptance of revoked server certificates via crafted OCSP response gnutls: GnuTLS: Policy bypass due to case-sensitive nameConstraints comparison gnutls: gnutls: Information disclosure via heap overread in RSA key exchange gnutls: gnutls: Information disclosure via timing side-channel in PKCS#7 padding removal gnutls: GnuTLS: Denial of Service via DTLS zero-length fragment gnutls: GnuTLS: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability gnutls: gnutls: Authentication Bypass via NUL Character in Username gnutls: gnutls: Security bypass due to incorrect name constraint handling gnutls: gnutls: Certificate validation bypass due to improper handling of URI and SRV SANs gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name gnutls: gnutls: Use-after-free in gnutls_pkcs11_token_set_pin gnutls: gnutls: Memory corruption due to off-by-one error in PKCS#12 bag handling

Affected: Rocky Linux:9: gnutls

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: Fix qsort comparator in DTLS reassembly (CVE-2026-42009) * gnutls: Fix crashing on an underflow with a DTLS datagram (CVE-2026-33845) * gnutls: Fix RSA-PSK identity truncation (CVE-2026-42010) * gnutls: Fix case-sensitivity of domain name comparison in name constraints (CVE-2026-3833) * gnutls: Fix intersecting empty name constraints (CVE-2026-42011) * gnutls: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly (CVE-2026-33846)

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.

Security update for gnutls

Affected: Ubuntu:Pro:20.04:LTS: gnutls28, Ubuntu:22.04:LTS: gnutls28, Ubuntu:Pro:FIPS-preview:22.04:LTS: gnutls28, Ubuntu:Pro:FIPS-updates:22.04:LTS: gnutls28, Ubuntu:24.04:LTS: gnutls28, Ubuntu:Pro:FIPS-updates:24.04:LTS: gnutls28, Ubuntu:25.10: gnutls28, Ubuntu:26.04:LTS: gnutls28

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.

The vulnerabilities found in LabX Standard versions 21.3.22 - 21.4.23 are CVE-2025-69419, CVE-2026-0915, CVE-2025-15467, CVE-2026-4800, CVE-2026-33186, CVE-2026-39821, CVE-2026-33671 and are fixed in LabX Standard v21.4.25.

The vulnerabilities found in LabX Enterprise versions 21.3.22 - 21.4.23 are CVE-2026-4800, CVE-2026-33186, CVE-2026-39821, CVE-2026-33671 and are fixed in LabX Enterprise v21.4.25

All other vulnerabilities are to be fixed in the upcoming releases.

Ein Angreifer kann mehrere Schwachstellen in GnuTLS ausnutzen, um Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand zu verursachen oder andere, nicht näher spezifizierte Angriffe durchzuführen.