{ "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/centos6els/vex/2026/cve-2026-50106-els_os-centos6els.json" } ], "tracking": { "current_release_date": "2026-10-28T10:59:26Z", "generator": { "date": "2026-10-28T10:59:26Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-50106-ELS_OS-CENTOS6ELS", "initial_release_date": "2026-10-21T09:17:00Z", "revision_history": [ { "date": "2026-10-21T09:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-10-28T10:59:26Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security update on 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"CentOS-6" }, { "category": "default_component_of", "full_product_name": { "name": "unbound-0:1.4.20-29.el6_10.1.x86_64 as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:unbound-0:1.4.20-29.el6_10.1.x86_64" }, "product_reference": "unbound-0:1.4.20-29.el6_10.1.x86_64", "relates_to_product_reference": "CentOS-6" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-50106", "cwe": { "id": "CWE-807", "name": "Reliance on Untrusted Inputs in a Security Decision" }, "notes": [ { "category": "description", "text": "When NLnet Labs Unbound up to and including version 1.26.1 is configured with both a root trust anchor and an additional 'trust-anchor:' for an island-of-security zone whose parent is provably insecure under the root chain, a malicious actor who can deliver one forged NXDOMAIN response for a name inside the island, with the NSEC/SOA RRSIG 'SignerName' set to the insecure parent, tricks Unbound's validator to use the root trust anchor instead, and consecutively the insecure parent, thus causing that record to be treated as insecure and denying existence for records in the trust island.", "title": "Vulnerability description" } ], "product_status": { "known_affected": [ "CentOS-6:unbound-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-50106" }, { "category": "external", "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50106.txt", "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50106.txt" } ], "release_date": "2026-10-21T09:17:00Z", "remediations": [ { "category": "no_fix_planned", "date": "2026-10-24T11:23:21.777201Z", "details": "This issue only triggers under a non-default setup where Unbound is configured with both the root trust anchor and an explicit trust-anchor for a DNSSEC “island” whose parent is provably insecure; standard configurations that use only the root trust anchor are unaffected. Even then, an attacker must inject a precisely timed forged NXDOMAIN response into the resolver’s traffic, which is difficult off‑path due to Unbound’s transaction‑ID and source‑port randomization. Impact is limited to denial of existence (availability) for names in that niche island configuration with no confidentiality or integrity risk, making it a safe deprioritization for typical enterprise VM/server deployments.", "product_ids": [ "CentOS-6:unbound-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-devel-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-libs-0:1.4.20-29.el6_10.1.x86_64", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.i686", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.i686", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64", "CentOS-6:unbound-python-0:1.4.20-29.el6_10.1.x86_64" ] } ] } ] }