{ "document": { "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "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 Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/tuxcare9.8esu/vex/2026/cve-2026-40691-els_os-tuxcare9_8esu.json" } ], "tracking": { "current_release_date": "2026-10-15T17:05:23Z", "generator": { "date": "2026-10-15T17:05:23Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-40691-ELS_OS-TUXCARE9.8ESU", "initial_release_date": "2026-07-22T14:17:00Z", "revision_history": [ { "date": "2026-07-22T14:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-10-05T07:22:09Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-10-15T17:05:23Z", "number": "3", "summary": 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Linux 9.8", "product_id": "Rocky Linux-9.8:unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64" }, "product_reference": "unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64 as a component of Rocky Linux 9.8", "product_id": "Rocky Linux-9.8:unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64" }, "product_reference": "unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "relates_to_product_reference": "Rocky Linux-9.8" }, { "category": "default_component_of", "full_product_name": { "name": "unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.i686 as a component of Rocky Linux 9.8", "product_id": "Rocky Linux-9.8:unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.i686" }, "product_reference": "unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "relates_to_product_reference": "Rocky Linux-9.8" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-40691", "cwe": { "id": "CWE-122", "name": "Heap-based Buffer Overflow" }, "notes": [ { "category": "description", "text": "In Unbound 1.9.0 up to and including 1.25.1, when a DNSCrypt query is received over TCP, the routine that encrypts the reply in place fails to bound the reply length against the destination buffer size. The size clamp that protects the UDP path is not applied on the TCP path, so a reply larger than 65504 bytes is shifted forward by 48 bytes inside a buffer of capacity equal to 'msg-buffer-size', writing past the end of the heap allocation. A single malicious encrypted query crashes the resolver and lead to denial of service. This vulnerability needs Unbound to be compiled with DNSCrypt support ('--enable-dnscrypt') and the 'dnscrypt:' clause to be configured and enabled for the listening interfaces.", "title": "Vulnerability description" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "AlmaLinux-9.8:python3-unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "AlmaLinux-9.8:python3-unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "AlmaLinux-9.8:python3-unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "AlmaLinux-9.8:unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "AlmaLinux-9.8:unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "AlmaLinux-9.8:unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "AlmaLinux-9.8:unbound-devel-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "AlmaLinux-9.8:unbound-devel-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "AlmaLinux-9.8:unbound-devel-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "AlmaLinux-9.8:unbound-dracut-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "AlmaLinux-9.8:unbound-dracut-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "AlmaLinux-9.8:unbound-dracut-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "AlmaLinux-9.8:unbound-libs-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "AlmaLinux-9.8:unbound-libs-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "AlmaLinux-9.8:unbound-libs-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "Rocky Linux-9.8:python3-unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "Rocky Linux-9.8:python3-unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "Rocky Linux-9.8:python3-unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "Rocky Linux-9.8:unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "Rocky Linux-9.8:unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "Rocky Linux-9.8:unbound-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "Rocky Linux-9.8:unbound-devel-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "Rocky Linux-9.8:unbound-devel-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "Rocky Linux-9.8:unbound-devel-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "Rocky Linux-9.8:unbound-dracut-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "Rocky Linux-9.8:unbound-dracut-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "Rocky Linux-9.8:unbound-dracut-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64", "Rocky Linux-9.8:unbound-libs-0:1.24.2-3.el9_8.8.tuxcare.els1.aarch64", "Rocky Linux-9.8:unbound-libs-0:1.24.2-3.el9_8.8.tuxcare.els1.i686", "Rocky Linux-9.8:unbound-libs-0:1.24.2-3.el9_8.8.tuxcare.els1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-40691" }, { "category": "external", "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-40691.txt", "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-40691.txt" } ], "release_date": "2026-07-22T14:17:00Z", "threats": [ { "category": "impact", "details": "Moderate" }, { "category": "impact", "date": "2026-10-15T15:24:51.479782Z", "details": "The unbound package for TuxCare 9.8 ESU is not affected by CVE-2026-40691. 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