RHSA-2026:19066
Vulnerability from csaf_opensuse - Published: 2026-05-19 13:40 - Updated: 2026-10-02 02:20Summary
Red Hat Security Advisory: openssl security update
Severity
Moderate
Notes
Topic: An update for openssl is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Moderate. 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: OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library.
Security Fix(es):
* openssl: openssl: Information Disclosure from Uninitialized Memory via Invalid RSA Public Key (CVE-2026-31790)
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 key group selection preference flaw has been discovered in OpenSSL. An OpenSSL TLS 1.3 server may fail to negotiate the expected preferred key exchange group when its key exchange group configuration includes the default by using the "DEFAULT" keyword. A less preferred key exchange may be used even when a more preferred group is supported by both client and server, if the group was not included among the client's initial predicated keyshares. This will sometimes be the case with the new hybrid post-quantum groups, if the client chooses to defer their use until specifically requested by the server. No OpenSSL FIPS modules are affected by this issue, the code in question lies outside the FIPS boundary.
6.5 (Medium)
Affected products
Fixed
41 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:openssl-debuginfo-1:3.5.5-2.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
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| Unresolved product id: AppStream-10.2.Z:openssl-debuginfo-1:3.5.5-2.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-debuginfo-1:3.5.5-2.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-debuginfo-1:3.5.5-2.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-debugsource-1:3.5.5-2.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-debugsource-1:3.5.5-2.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-debugsource-1:3.5.5-2.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-debugsource-1:3.5.5-2.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-devel-1:3.5.5-2.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-devel-1:3.5.5-2.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-devel-1:3.5.5-2.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-devel-1:3.5.5-2.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-libs-debuginfo-1:3.5.5-2.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-libs-debuginfo-1:3.5.5-2.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-libs-debuginfo-1:3.5.5-2.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-libs-debuginfo-1:3.5.5-2.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-perl-1:3.5.5-2.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-perl-1:3.5.5-2.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-perl-1:3.5.5-2.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:openssl-perl-1:3.5.5-2.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-1:3.5.5-2.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-1:3.5.5-2.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-1:3.5.5-2.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-1:3.5.5-2.el10_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-1:3.5.5-2.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-debuginfo-1:3.5.5-2.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-debuginfo-1:3.5.5-2.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-debuginfo-1:3.5.5-2.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-debuginfo-1:3.5.5-2.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-debugsource-1:3.5.5-2.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-debugsource-1:3.5.5-2.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-debugsource-1:3.5.5-2.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-debugsource-1:3.5.5-2.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-libs-1:3.5.5-2.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-libs-1:3.5.5-2.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-libs-1:3.5.5-2.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-libs-1:3.5.5-2.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-libs-debuginfo-1:3.5.5-2.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-libs-debuginfo-1:3.5.5-2.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-libs-debuginfo-1:3.5.5-2.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:openssl-libs-debuginfo-1:3.5.5-2.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in openssl. Applications that use RSASVE key encapsulation, a method for securely exchanging encryption keys, may inadvertently expose sensitive data. This vulnerability arises when an application processes a malicious, invalid RSA public key provided by an attacker without proper validation. Consequently, the application might send the contents of an uninitialized memory buffer, which could contain confidential information, to the attacker.
5.9 (Medium)
Affected products
Fixed
41 products, the same list as for
CVE-2026-2673
Threats
Impact
Moderate
References
16 references
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"category": "other",
"text": "The impact of this flaw is limited to the choice of key agreement groups in a specific TLS connection. While a less a preferred key agreement group may allow for a connection to lack post-quantum protection, it is important to know that the connection will still be encrypted with a secure classical cipher and that the degradation of the cipher is limited to the active connection and is not a persistent degradation. Groups which the server operator has disallowed will not be used and it may be the case that the client and server fail to agree upon a key exchange group which would prevent the offending client from constructing a TLS connection.",
"title": "Statement"
},
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"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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],
"title": "openssl: OpenSSL TLS 1.3 server may choose unexpected key agreement group"
},
{
"cve": "CVE-2026-31790",
"cwe": {
"id": "CWE-824",
"name": "Access of Uninitialized Pointer"
},
"discovery_date": "2026-03-25T02:59:10.179000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2451094"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in openssl. Applications that use RSASVE key encapsulation, a method for securely exchanging encryption keys, may inadvertently expose sensitive data. This vulnerability arises when an application processes a malicious, invalid RSA public key provided by an attacker without proper validation. Consequently, the application might send the contents of an uninitialized memory buffer, which could contain confidential information, to the attacker.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openssl: openssl: Information Disclosure from Uninitialized Memory via Invalid RSA Public Key",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Moderate impact. This flaw affects applications utilizing RSASVE key encapsulation, where an attacker-supplied invalid RSA public key is used with EVP_PKEY_encapsulate() without prior validation. This can lead to the disclosure of sensitive, uninitialized memory buffer contents to a malicious peer.",
"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": [
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"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-31790"
},
{
"category": "external",
"summary": "RHBZ#2451094",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451094"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-31790",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-31790"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-31790",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31790"
},
{
"category": "external",
"summary": "https://openssl-library.org/news/secadv/20260407.txt",
"url": "https://openssl-library.org/news/secadv/20260407.txt"
}
],
"release_date": "2026-04-07T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-19T13:40:14+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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"url": "https://access.redhat.com/errata/RHSA-2026:19066"
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"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "openssl: openssl: Information Disclosure from Uninitialized Memory via Invalid RSA Public Key"
}
]
}
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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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