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        "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"
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        "summary": "Canonical URL",
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          "number": "1",
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        "name": "Expected Behavior Violation"
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          "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"
        }
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        ]
      },
      "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"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:24013",
          "url": "https://access.redhat.com/errata/RHSA-2026:24013"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:36320",
          "url": "https://access.redhat.com/errata/RHSA-2026:36320"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:36777",
          "url": "https://access.redhat.com/errata/RHSA-2026:36777"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:37282",
          "url": "https://access.redhat.com/errata/RHSA-2026:37282"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/cve/CVE-2026-42534",
          "url": "https://access.redhat.com/security/cve/CVE-2026-42534"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2480131",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480131"
        },
        {
          "category": "external",
          "summary": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42534.json",
          "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42534.json"
        }
      ],
      "release_date": "2026-05-20T10:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-10-15T10:08:31.572965Z",
          "details": "- CVE-2026-42534 in Unbound ≤1.25.0 only degrades resolution performance (availability) by skewing jostle-aging for duplicate queries; confidentiality and integrity are unaffected, and cache/local-data replies remain normal. \n- Exploitation requires an attacker who can send queries to the resolver and also control a slow/malicious authoritative DNS server, and the effect appears only once num-queries-per-thread is saturated so the jostle logic engages. \n- Because Unbound’s default access controls permit recursion only from localhost unless explicitly opened, and resolvers in managed server/VM deployments are commonly not internet-exposed, practical exposure is limited and this issue can be safely deprioritized.",
          "product_ids": [
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.x86_64",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.x86_64",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.x86_64",
            "Oracle-Linux-6:unbound-python-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
            "Oracle-Linux-6:unbound-python-0:1.4.20-29.el6_10.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.x86_64",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.x86_64",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
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            "Oracle-Linux-6:unbound-python-0:1.4.20-29.el6_10.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}