{ "document": { "aggregate_severity": { "text": "Medium" }, "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/centos-stream8els/vex/2026/cve-2026-42534-els_os-centos-stream8els.json" } ], "tracking": { "current_release_date": "2026-05-25T14:34:03Z", "generator": { "date": "2026-05-25T14:34:03Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-42534-ELS_OS-CENTOS-STREAM8ELS", "initial_release_date": "2026-05-20T10:16:00Z", "revision_history": [ { "date": "2026-05-20T10:16:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-05-25T14:34:03Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": 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"relates_to_product_reference": "CentOS-Stream-8" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-42534", "cwe": { "id": "CWE-440", "name": "Expected Behavior Violation" }, "notes": [ { "category": "description", "text": "NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the jostle logic that could defeat its purpose and degrade resolution performance. Retransmits of the same query could renew the age of slow running queries and not allow the jostle logic to see them as aged and potential targets for replacement with new queries. An adversary who can query a vulnerable Unbound and who can control a domain name server that replies slowly and/or maliciously to Unbound's queries can exploit the vulnerability and degrade the resolution performance of Unbound. When Unbound's 'num-queries-per-thread' reaches its limit, the jostle logic kicks in. When a new query comes in, half of the available queries that are also slow to resolve are candidates for replacement. The vulnerability then happens because duplicate queries that need resolution would skew the aging result by using the timestamp of the latest duplicate query instead of the original one that started the resolution effort. Cache and local data response performance remains unaffected. Coordinated attacks could raise this to a denial of resolution service. Unbound 1.25.1 contains a patch with a fix to attach an initial, non-updatable start time for incoming queries that allow the jostle logic to work as intended.", "title": "Vulnerability description" }, { "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": { "known_affected": [ "CentOS-Stream-8:python3-unbound-0:1.16.2-5.el8.tuxcare.els1.x86_64", "CentOS-Stream-8:python3-unbound-0:1.16.2-5.el8.tuxcare.els2.x86_64", "CentOS-Stream-8:python3-unbound-0:1.16.2-5.el8.tuxcare.els3.x86_64", "CentOS-Stream-8:python3-unbound-0:1.16.2-5.el8.tuxcare.els4.x86_64", "CentOS-Stream-8:python3-unbound-0:1.16.2-5.el8.tuxcare.els5.x86_64", "CentOS-Stream-8:python3-unbound-0:1.16.2-5.el8.x86_64", "CentOS-Stream-8:unbound-0:1.16.2-5.el8.tuxcare.els1.x86_64", "CentOS-Stream-8:unbound-0:1.16.2-5.el8.tuxcare.els2.x86_64", "CentOS-Stream-8:unbound-0:1.16.2-5.el8.tuxcare.els3.x86_64", "CentOS-Stream-8:unbound-0:1.16.2-5.el8.tuxcare.els4.x86_64", "CentOS-Stream-8:unbound-0:1.16.2-5.el8.tuxcare.els5.x86_64", "CentOS-Stream-8:unbound-0:1.16.2-5.el8.x86_64", "CentOS-Stream-8:unbound-devel-0:1.16.2-5.el8.i686", "CentOS-Stream-8:unbound-devel-0:1.16.2-5.el8.tuxcare.els1.i686", "CentOS-Stream-8:unbound-devel-0:1.16.2-5.el8.tuxcare.els1.x86_64", "CentOS-Stream-8:unbound-devel-0:1.16.2-5.el8.tuxcare.els2.i686", "CentOS-Stream-8:unbound-devel-0:1.16.2-5.el8.tuxcare.els2.x86_64", "CentOS-Stream-8:unbound-devel-0:1.16.2-5.el8.tuxcare.els3.i686", "CentOS-Stream-8:unbound-devel-0:1.16.2-5.el8.tuxcare.els3.x86_64", "CentOS-Stream-8:unbound-devel-0:1.16.2-5.el8.tuxcare.els4.i686", "CentOS-Stream-8:unbound-devel-0:1.16.2-5.el8.tuxcare.els4.x86_64", "CentOS-Stream-8:unbound-devel-0:1.16.2-5.el8.tuxcare.els5.i686", "CentOS-Stream-8:unbound-devel-0:1.16.2-5.el8.tuxcare.els5.x86_64", "CentOS-Stream-8:unbound-devel-0:1.16.2-5.el8.x86_64", "CentOS-Stream-8:unbound-libs-0:1.16.2-5.el8.i686", "CentOS-Stream-8:unbound-libs-0:1.16.2-5.el8.tuxcare.els1.i686", "CentOS-Stream-8:unbound-libs-0:1.16.2-5.el8.tuxcare.els1.x86_64", "CentOS-Stream-8:unbound-libs-0:1.16.2-5.el8.tuxcare.els2.i686", "CentOS-Stream-8:unbound-libs-0:1.16.2-5.el8.tuxcare.els2.x86_64", "CentOS-Stream-8:unbound-libs-0:1.16.2-5.el8.tuxcare.els3.i686", "CentOS-Stream-8:unbound-libs-0:1.16.2-5.el8.tuxcare.els3.x86_64", "CentOS-Stream-8:unbound-libs-0:1.16.2-5.el8.tuxcare.els4.i686", "CentOS-Stream-8:unbound-libs-0:1.16.2-5.el8.tuxcare.els4.x86_64", "CentOS-Stream-8:unbound-libs-0:1.16.2-5.el8.tuxcare.els5.i686", "CentOS-Stream-8:unbound-libs-0:1.16.2-5.el8.tuxcare.els5.x86_64", "CentOS-Stream-8:unbound-libs-0:1.16.2-5.el8.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-42534" }, { "category": "external", "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42534.txt", "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42534.txt" } ], "release_date": "2026-05-20T10:16:00Z", "remediations": [ { "category": "no_fix_planned", "date": "2026-05-21T17:47:09.385843Z", "details": "CVE-2026-42534 only affects Unbound’s internal jostle-eviction heuristic when the per‑thread outstanding‑query limit is already saturated, causing resolution slowdowns without any confidentiality or integrity impact, and with cache/local-data answers unaffected. Exploitation requires an actor who can query the resolver and simultaneously control a slow or malicious authoritative server while generating duplicate queries to keep slots from aging—preconditions that are nontrivial to meet for recursive resolvers that restrict access to trusted networks. Given these narrow conditions and the DoS‑only impact, it is reasonable to treat this as a low‑priority issue in centrally managed enterprise VM/server environments.", "product_ids": [ "CentOS-Stream-8:python3-unbound-0:1.16.2-5.el8.tuxcare.els1.x86_64", "CentOS-Stream-8:python3-unbound-0:1.16.2-5.el8.tuxcare.els2.x86_64", "CentOS-Stream-8:python3-unbound-0:1.16.2-5.el8.tuxcare.els3.x86_64", "CentOS-Stream-8:python3-unbound-0:1.16.2-5.el8.tuxcare.els4.x86_64", "CentOS-Stream-8:python3-unbound-0:1.16.2-5.el8.tuxcare.els5.x86_64", "CentOS-Stream-8:python3-unbound-0:1.16.2-5.el8.x86_64", "CentOS-Stream-8:unbound-0:1.16.2-5.el8.tuxcare.els1.x86_64", "CentOS-Stream-8:unbound-0:1.16.2-5.el8.tuxcare.els2.x86_64", "CentOS-Stream-8:unbound-0:1.16.2-5.el8.tuxcare.els3.x86_64", "CentOS-Stream-8:unbound-0:1.16.2-5.el8.tuxcare.els4.x86_64", "CentOS-Stream-8:unbound-0:1.16.2-5.el8.tuxcare.els5.x86_64", "CentOS-Stream-8:unbound-0:1.16.2-5.el8.x86_64", 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