CVE-2026-5946

{"id": "CVE-2026-5946", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "security-officer@isc.org", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2026-05-20T13:16:40.157", "references": [{"url": "https://downloads.isc.org/isc/bind9/9.18.49", "tags": ["Patch"], "source": "security-officer@isc.org"}, {"url": "https://downloads.isc.org/isc/bind9/9.20.23", "tags": ["Patch"], "source": "security-officer@isc.org"}, {"url": "https://downloads.isc.org/isc/bind9/9.21.22", "tags": ["Patch"], "source": "security-officer@isc.org"}, {"url": "https://kb.isc.org/docs/cve-2026-5946", "tags": ["Vendor Advisory"], "source": "security-officer@isc.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-officer@isc.org", "description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-617"}, {"lang": "en", "value": "CWE-754"}, {"lang": "en", "value": "CWE-843"}]}], "descriptions": [{"lang": "en", "value": "Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) \u2014 for example, `CHAOS` or `HESIOD`, or DNS messages that specify meta-classes (`ANY` or `NONE`) in the question section. Specially crafted requests reaching the affected code paths \u2014 recursion, dynamic updates (`UPDATE`), zone change notifications (`NOTIFY`), or processing of `IN`-specific record types in non-`IN` data \u2014 can cause assertion failures in `named`.\nThis issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1."}], "lastModified": "2026-05-21T15:24:29.463", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "9EC5B9B1-25F2-48CA-9E8A-59D8E81D408A", "versionEndIncluding": "9.16.50", "versionStartIncluding": "9.11.0"}, {"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "49533F8C-D7B5-450A-8808-7E1C76F4FAE4", "versionEndExcluding": "9.18.49", "versionStartIncluding": "9.18.0"}, {"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "D92461F1-BA01-479E-B740-38855CC216E6", "versionEndExcluding": "9.20.23", "versionStartIncluding": "9.20.0"}, {"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "B254E8E7-3F57-4552-ACBF-623FA481B697", "versionEndExcluding": "9.21.22", "versionStartIncluding": "9.21.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-officer@isc.org"}