{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Moderate" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "summary", "text": "An update for osbuild-composer is now available for Red Hat Enterprise Linux 10.0 Extended Update Support.\n\nRed 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.", "title": "Topic" }, { "category": "general", "text": "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.\n\nSecurity Fix(es):\n\n* crypto/tls: Unexpected session resumption in crypto/tls (CVE-2025-68121)\n\nFor 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.", "title": "Details" }, { "category": "legal_disclaimer", "text": "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.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "https://access.redhat.com/errata/RHSA-2026:17686", "url": "https://access.redhat.com/errata/RHSA-2026:17686" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#moderate", "url": "https://access.redhat.com/security/updates/classification/#moderate" }, { "category": "external", "summary": "2437111", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2437111" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_17686.json" } ], "title": "Red Hat Security Advisory: osbuild-composer security update", "tracking": { "current_release_date": "2026-07-02T15:38:05+00:00", "generator": { "date": "2026-07-02T15:38:05+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.3.1" } }, "id": "RHSA-2026:17686", "initial_release_date": "2026-05-14T19:28:08+00:00", "revision_history": [ { "date": "2026-05-14T19:28:08+00:00", "number": "1", "summary": "Initial version" }, { "date": "2026-05-14T19:28:08+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2026-07-02T15:38:05+00:00", "number": "3", "summary": "Last generated version" } ], "status": "final", "version": "3" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Red Hat Enterprise Linux AppStream EUS (v. 10.0)", "product": { "name": "Red Hat Enterprise Linux AppStream EUS (v. 10.0)", 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"category": "default_component_of", "full_product_name": { "name": "osbuild-composer-worker-debuginfo-0:134.1-6.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)", "product_id": "AppStream-10.0.Z.E2S:osbuild-composer-worker-debuginfo-0:134.1-6.el10_0.x86_64" }, "product_reference": "osbuild-composer-worker-debuginfo-0:134.1-6.el10_0.x86_64", "relates_to_product_reference": "AppStream-10.0.Z.E2S" } ] }, "vulnerabilities": [ { "cve": "CVE-2025-68121", "discovery_date": "2026-02-05T18:01:30.086058+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2437111" } ], "notes": [ { "category": "description", "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.", "title": "Vulnerability description" }, { "category": "summary", "text": "crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption", "title": "Vulnerability summary" }, { "category": "other", "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's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-10.0.Z.E2S:osbuild-composer-0:134.1-6.el10_0.aarch64", "AppStream-10.0.Z.E2S:osbuild-composer-0:134.1-6.el10_0.ppc64le", "AppStream-10.0.Z.E2S:osbuild-composer-0:134.1-6.el10_0.s390x", "AppStream-10.0.Z.E2S:osbuild-composer-0:134.1-6.el10_0.src", "AppStream-10.0.Z.E2S:osbuild-composer-0:134.1-6.el10_0.x86_64", "AppStream-10.0.Z.E2S:osbuild-composer-core-0:134.1-6.el10_0.aarch64", "AppStream-10.0.Z.E2S:osbuild-composer-core-0:134.1-6.el10_0.ppc64le", "AppStream-10.0.Z.E2S:osbuild-composer-core-0:134.1-6.el10_0.s390x", 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"AppStream-10.0.Z.E2S:osbuild-composer-tests-debuginfo-0:134.1-6.el10_0.x86_64", "AppStream-10.0.Z.E2S:osbuild-composer-worker-0:134.1-6.el10_0.aarch64", "AppStream-10.0.Z.E2S:osbuild-composer-worker-0:134.1-6.el10_0.ppc64le", "AppStream-10.0.Z.E2S:osbuild-composer-worker-0:134.1-6.el10_0.s390x", "AppStream-10.0.Z.E2S:osbuild-composer-worker-0:134.1-6.el10_0.x86_64", "AppStream-10.0.Z.E2S:osbuild-composer-worker-debuginfo-0:134.1-6.el10_0.aarch64", "AppStream-10.0.Z.E2S:osbuild-composer-worker-debuginfo-0:134.1-6.el10_0.ppc64le", "AppStream-10.0.Z.E2S:osbuild-composer-worker-debuginfo-0:134.1-6.el10_0.s390x", "AppStream-10.0.Z.E2S:osbuild-composer-worker-debuginfo-0:134.1-6.el10_0.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "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 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