RHSA-2026:17686
Vulnerability from csaf_redhat - Published: 2026-05-14 19:28 - Updated: 2026-05-22 21:11Summary
Red Hat Security Advisory: osbuild-composer security update
Severity
Moderate
Notes
Topic: An update for osbuild-composer 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 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: A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild under the hood. Besides building images for local usage, it can also upload images directly to cloud. It is compatible with composer-cli and cockpit-composer clients.
Security Fix(es):
* crypto/tls: Unexpected session resumption in crypto/tls (CVE-2025-68121)
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 the crypto/tls component. This vulnerability occurs during Transport Layer Security (TLS) session resumption when certificate authority (CA) settings are modified between the initial and resumed handshakes. An attacker could exploit this to bypass certificate validation, allowing a client or server to establish a connection that should have been rejected. This could lead to an authentication bypass under specific conditions.
7.4 (High)
Affected products
Fixed
29 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-0:134.1-6.el10_0.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-0:134.1-6.el10_0.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-0:134.1-6.el10_0.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-0:134.1-6.el10_0.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-0:134.1-6.el10_0.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-core-0:134.1-6.el10_0.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-core-0:134.1-6.el10_0.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-core-0:134.1-6.el10_0.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-core-0:134.1-6.el10_0.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-core-debuginfo-0:134.1-6.el10_0.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-core-debuginfo-0:134.1-6.el10_0.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-core-debuginfo-0:134.1-6.el10_0.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-core-debuginfo-0:134.1-6.el10_0.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-debugsource-0:134.1-6.el10_0.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-debugsource-0:134.1-6.el10_0.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-debugsource-0:134.1-6.el10_0.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-debugsource-0:134.1-6.el10_0.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-tests-debuginfo-0:134.1-6.el10_0.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-tests-debuginfo-0:134.1-6.el10_0.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-tests-debuginfo-0:134.1-6.el10_0.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-tests-debuginfo-0:134.1-6.el10_0.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-worker-0:134.1-6.el10_0.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-worker-0:134.1-6.el10_0.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-worker-0:134.1-6.el10_0.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-worker-0:134.1-6.el10_0.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-worker-debuginfo-0:134.1-6.el10_0.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-worker-debuginfo-0:134.1-6.el10_0.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-worker-debuginfo-0:134.1-6.el10_0.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.0.Z.E2S:osbuild-composer-worker-debuginfo-0:134.1-6.el10_0.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
References
12 references
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"text": "A flaw was found in the crypto/tls component. This vulnerability occurs during Transport Layer Security (TLS) session resumption when certificate authority (CA) settings are modified between the initial and resumed handshakes. An attacker could exploit this to bypass certificate validation, allowing a client or server to establish a connection that should have been rejected. This could lead to an authentication bypass under specific conditions.",
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"text": "crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption",
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"text": "This is a moderate flaw because it only occurs under specific conditions, such as TLS session resumption with runtime changes to certificate authority settings. Exploitation is not straightforward and requires a controlled setup. The impact is limited to certificate validation within the same component and does not affect system availability.",
"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.",
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"url": "https://access.redhat.com/security/cve/CVE-2025-68121"
},
{
"category": "external",
"summary": "RHBZ#2437111",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2437111"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-68121",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-68121"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-68121",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68121"
},
{
"category": "external",
"summary": "https://go.dev/cl/737700",
"url": "https://go.dev/cl/737700"
},
{
"category": "external",
"summary": "https://go.dev/issue/77217",
"url": "https://go.dev/issue/77217"
},
{
"category": "external",
"summary": "https://groups.google.com/g/golang-announce/c/K09ubi9FQFk",
"url": "https://groups.google.com/g/golang-announce/c/K09ubi9FQFk"
},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-4337",
"url": "https://pkg.go.dev/vuln/GO-2026-4337"
}
],
"release_date": "2026-02-05T17:48:44.141000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-14T19:28:08+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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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"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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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption"
}
]
}
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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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