{ "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-2026-55990-els_os-tuxcare9_8esu.json" } ], "tracking": { "current_release_date": "2026-10-15T17:05:10Z", "generator": { "date": "2026-10-15T17:05:10Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-55990-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": "2026-10-15T17:05:10Z", "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-2026-55990", "cwe": { "id": "CWE-457", "name": "Use of Uninitialized Variable" }, "notes": [ { "category": "description", "text": "In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when the 'dnscrypt:' clause lists more 'dnscrypt-provider-cert:' files than there are matching 'dnscrypt-secret-key:' files, Unbound fills only the matched prefix and leaves the tail slots at the '0xdb' fill that libsodium's allocator writes into every allocation. Unbound would then iterate over the number of cert files, not the actual slots, so it walks into a slot with garbage data filled with '0xdb' bytes. Any unauthenticated client that sends one UDP datagram of ≥ 68 bytes whose first 8 bytes are '0xdb' to 'dnscrypt-port' will use that garbage entry which leads to a garbage dereference killing the server. This is a silent faulty configuration that goes unnoticed until triggered with the right client query. Unbound needs to be compiled with DNSCrypt support ('--enable-dnscrypt').", "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-2026-55990" }, { "category": "external", "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-55990.txt", "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-55990.txt" } ], "release_date": "2026-07-22T14:17:00Z", "threats": [ { "category": "impact", "details": "Moderate" }, { "category": "impact", "date": "2026-10-15T15:24:51.419427Z", "details": "The unbound package for TuxCare 9.8 ESU is not affected by CVE-2026-55990. 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