CVE-2026-19667

{"id": "CVE-2026-19667", "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}]}, "affected": [{"source": "security-officer@isc.org", "affectedData": [{"vendor": "ISC", "product": "BIND 9", "versions": [{"status": "affected", "version": "9.11.0", "versionType": "custom", "lessThanOrEqual": "9.18.50"}, {"status": "affected", "version": "9.20.0", "versionType": "custom", "lessThanOrEqual": "9.20.27"}, {"status": "affected", "version": "9.21.0", "versionType": "custom", "lessThanOrEqual": "9.21.25"}, {"status": "affected", "version": "9.11.3-S1", "versionType": "custom", "lessThanOrEqual": "9.18.50-S1"}, {"status": "affected", "version": "9.20.9-S1", "versionType": "custom", "lessThanOrEqual": "9.20.27-S1"}], "defaultStatus": "unaffected"}]}], "published": "2026-09-16T14:17:05.037", "references": [{"url": "https://downloads.isc.org/isc/bind9/9.20.29", "source": "security-officer@isc.org"}, {"url": "https://downloads.isc.org/isc/bind9/9.21.26", "source": "security-officer@isc.org"}, {"url": "https://kb.isc.org/docs/cve-2026-19667", "source": "security-officer@isc.org"}], "vulnStatus": "Received", "weaknesses": [{"type": "Secondary", "source": "security-officer@isc.org", "description": [{"lang": "en", "value": "CWE-197"}]}], "descriptions": [{"lang": "en", "value": "If an attacker-controlled authoritative server can produce a negative answer that is exactly 65536 bytes, then a flaw in `named` results in a negative cache entry of 0 bytes. When this entry is subsequently read, `named` aborts.\nThis issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1."}], "lastModified": "2026-09-16T14:17:05.037", "sourceIdentifier": "security-officer@isc.org"}