{"api_version":"1","generated_at":"2026-07-23T14:46:26+00:00","cve":"CVE-2026-12617","urls":{"html":"https://cve.report/CVE-2026-12617","api":"https://cve.report/api/cve/CVE-2026-12617.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-12617","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-12617"},"summary":{"title":"Record ordering based unexpected exit with CNAME or DNAME","description":"The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, `named` may quit unexpectedly. Or, if a client queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds positively to the A query but delays the CNAME response and later responds with a self-referential CNAME, the same failure may occur.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.","state":"PUBLISHED","assigner":"isc","published_at":"2026-07-22 15:16:51","updated_at":"2026-07-22 20:33:11"},"problem_types":["CWE-617","CWE-617 CWE-617 Reachable 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would like to thank Qifan Zhang of Palo Alto Networks for bringing this vulnerability to our attention."}],"datePublic":"2026-07-22T00:00:00.000Z","descriptions":[{"lang":"en","value":"The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, `named` may quit unexpectedly. Or, if a client queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds positively to the A query but delays the CNAME response and later responds with a self-referential CNAME, the same failure may occur.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1."}],"exploits":[{"lang":"en","value":"We are not aware of any active exploits."}],"impacts":[{"descriptions":[{"lang":"en","value":"If one of these situations is encountered, BIND may exit with an assertion."}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","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:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-617","description":"CWE-617 Reachable Assertion","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-07-22T14:14:46.397Z","orgId":"404fd4d2-a609-4245-b543-2c944a302a22","shortName":"isc"},"references":[{"name":"CVE-2026-12617","tags":["vendor-advisory"],"url":"https://kb.isc.org/docs/cve-2026-12617"},{"tags":["patch"],"url":"https://downloads.isc.org/isc/bind9/9.20.26"}],"solutions":[{"lang":"en","value":"Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26 or 9.20.26-S1."}],"source":{"discovery":"EXTERNAL"},"title":"Record ordering based unexpected exit with CNAME or DNAME","workarounds":[{"lang":"en","value":"No workarounds known."}],"x_generator":{"engine":"cvelib 1.8.0"}}},"cveMetadata":{"assignerOrgId":"404fd4d2-a609-4245-b543-2c944a302a22","assignerShortName":"isc","cveId":"CVE-2026-12617","datePublished":"2026-07-22T14:14:46.397Z","dateReserved":"2026-06-18T13:52:43.335Z","dateUpdated":"2026-07-22T18:48:15.278Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-22 15:16:51","lastModifiedDate":"2026-07-22 20:33:11","problem_types":["CWE-617","CWE-617 CWE-617 Reachable Assertion"],"metrics":{"cvssMetricV31":[{"source":"security-officer@isc.org","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-22T18:48:06.430818Z","id":"CVE-2026-12617","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"12617","Ordinal":"1","Title":"Record ordering based unexpected exit with CNAME or DNAME","CVE":"CVE-2026-12617","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"12617","Ordinal":"1","NoteData":"The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, `named` may quit unexpectedly. Or, if a client queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds positively to the A query but delays the CNAME response and later responds with a self-referential CNAME, the same failure may occur.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.","Type":"Description","Title":"Record ordering based unexpected exit with CNAME or DNAME"}]}}}