CVE-2026-12617

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-12617", "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22", "state": "PUBLISHED", "assignerShortName": "isc", "dateReserved": "2026-06-18T13:52:43.335Z", "datePublished": "2026-07-22T14:14:46.397Z", "dateUpdated": "2026-07-22T18:48:15.278Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "404fd4d2-a609-4245-b543-2c944a302a22", "shortName": "isc", "dateUpdated": "2026-07-22T14:14:46.397Z"}, "title": "Record ordering based unexpected exit with CNAME or DNAME", "datePublic": "2026-07-22T00:00:00.000Z", "affected": [{"vendor": "ISC", "product": "BIND 9", "versions": [{"version": "9.18.0", "lessThanOrEqual": "9.18.50", "status": "affected", "versionType": "custom"}, {"version": "9.20.0", "lessThanOrEqual": "9.20.24", "status": "affected", "versionType": "custom"}, {"version": "9.18.11-S1", "lessThanOrEqual": "9.18.50-S1", "status": "affected", "versionType": "custom"}, {"version": "9.20.9-S1", "lessThanOrEqual": "9.20.24-S1", "status": "affected", "versionType": "custom"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"nodes": [{"operator": "OR", "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.18.0", "versionEndIncluding": "9.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.20.0", "versionEndIncluding": "9.20.24"}, {"vulnerable": true, "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.18.11-S1", "versionEndIncluding": "9.18.50-S1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.20.9-S1", "versionEndIncluding": "9.20.24-S1"}]}]}], "metrics": [{"cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "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"}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-617", "description": "CWE-617 Reachable Assertion"}]}], "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."}], "impacts": [{"descriptions": [{"lang": "en", "value": "If one of these situations is encountered, BIND may exit with an assertion."}]}], "workarounds": [{"lang": "en", "value": "No workarounds known."}], "exploits": [{"lang": "en", "value": "We are not aware of any active exploits."}], "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."}], "credits": [{"lang": "en", "value": "ISC would like to thank Qifan Zhang of Palo Alto Networks for bringing this vulnerability to our attention."}], "references": [{"url": "https://kb.isc.org/docs/cve-2026-12617", "name": "CVE-2026-12617", "tags": ["vendor-advisory"]}, {"url": "https://downloads.isc.org/isc/bind9/9.20.26", "tags": ["patch"]}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-22T18:48:06.430818Z", "id": "CVE-2026-12617", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-22T18:48:15.278Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-12617", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-22T18:48:06.430818Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-22T18:48:11.314Z"}}], "cna": {"title": "Record ordering based unexpected exit with CNAME or DNAME", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "value": "ISC would like to thank Qifan Zhang of Palo Alto Networks for bringing this vulnerability to our attention."}], "impacts": [{"descriptions": [{"lang": "en", "value": "If one of these situations is encountered, BIND may exit with an assertion."}]}], "metrics": [{"cvssV3_1": {"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"}}], "affected": [{"vendor": "ISC", "product": "BIND 9", "versions": [{"status": "affected", "version": "9.18.0", "versionType": "custom", "lessThanOrEqual": "9.18.50"}, {"status": "affected", "version": "9.20.0", "versionType": "custom", "lessThanOrEqual": "9.20.24"}, {"status": "affected", "version": "9.18.11-S1", "versionType": "custom", "lessThanOrEqual": "9.18.50-S1"}, {"status": "affected", "version": "9.20.9-S1", "versionType": "custom", "lessThanOrEqual": "9.20.24-S1"}], "defaultStatus": "unaffected"}], "exploits": [{"lang": "en", "value": "We are not aware of any active exploits."}], "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."}], "datePublic": "2026-07-22T00:00:00.000Z", "references": [{"url": "https://kb.isc.org/docs/cve-2026-12617", "name": "CVE-2026-12617", "tags": ["vendor-advisory"]}, {"url": "https://downloads.isc.org/isc/bind9/9.20.26", "tags": ["patch"]}], "workarounds": [{"lang": "en", "value": "No workarounds known."}], "x_generator": {"engine": "cvelib 1.8.0"}, "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-617", "description": "CWE-617 Reachable Assertion"}]}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndIncluding": "9.18.50", "versionStartIncluding": "9.18.0"}, {"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndIncluding": "9.20.24", "versionStartIncluding": "9.20.0"}, {"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndIncluding": "9.18.50-S1", "versionStartIncluding": "9.18.11-S1"}, {"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndIncluding": "9.20.24-S1", "versionStartIncluding": "9.20.9-S1"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "404fd4d2-a609-4245-b543-2c944a302a22", "shortName": "isc", "dateUpdated": "2026-07-22T14:14:46.397Z"}}}, "cveMetadata": {"cveId": "CVE-2026-12617", "state": "PUBLISHED", "dateUpdated": "2026-07-22T18:48:15.278Z", "dateReserved": "2026-06-18T13:52:43.335Z", "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22", "datePublished": "2026-07-22T14:14:46.397Z", "assignerShortName": "isc"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "BIND 9", "vendor": "ISC", "versions": [{"lessThanOrEqual": "9.18.50", "status": "affected", "version": "9.18.0", "versionType": "custom"}, {"lessThanOrEqual": "9.20.24", "status": "affected", "version": "9.20.0", "versionType": "custom"}, {"lessThanOrEqual": "9.18.50-S1", "status": "affected", "version": "9.18.11-S1", "versionType": "custom"}, {"lessThanOrEqual": "9.20.24-S1", "status": "affected", "version": "9.20.9-S1", "versionType": "custom"}]}], "source": "security-officer@isc.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "matchCriteriaId": "F311703A-5945-4295-A036-5D878F136343", "versionEndIncluding": "9.18.50", "versionStartIncluding": "9.18.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:supported_preview:*:*:*", "matchCriteriaId": "F1177F3C-7BE7-4ECA-8EAB-80B3C9EF77B3", "versionEndIncluding": "9.18.50", "versionStartIncluding": "9.18.11", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "matchCriteriaId": "080D7F98-9784-4586-8ADA-CAAA0A9EC180", "versionEndIncluding": "9.20.24", "versionStartIncluding": "9.20.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:supported_preview:*:*:*", "matchCriteriaId": "AA853047-029C-4BC6-9C8C-10B183B9FB9E", "versionEndIncluding": "9.20.24", "versionStartIncluding": "9.20.9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}, {"lang": "es", "value": "El problema es la terminaci\u00f3n inesperada del programa basada en el orden y/o el contenido espec\u00edfico en las respuestas a las consultas de registros CNAME o DNAME, y registros A. Espec\u00edficamente, si un cliente consulta por un registro DNAME y un registro A por debajo del DNAME al resolvedor, y el servidor autoritativo responde positivamente a la consulta A pero retrasa la respuesta DNAME y luego responde negativamente, \u2019named\u2019 puede cerrarse inesperadamente. O, si un cliente consulta por un registro CNAME y un registro A para el mismo nombre al resolvedor, y el servidor autoritativo responde positivamente a la consulta A pero retrasa la respuesta CNAME y luego responde con un CNAME autorreferencial, la misma falla puede ocurrir.\nEste problema afecta a las versiones de BIND 9 9.18.0 a 9.18.50, 9.20.0 a 9.20.24, 9.18.11-S1 a 9.18.50-S1, y 9.20.9-S1 a 9.20.24-S1."}], "id": "CVE-2026-12617", "lastModified": "2026-11-02T16:28:17.337", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-officer@isc.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-12617", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-22T18:48:06.430818Z", "version": "2.0.3"}}]}, "published": "2026-07-22T15:16:51.963", "references": [{"source": "security-officer@isc.org", "tags": ["Product"], "url": "https://downloads.isc.org/isc/bind9/9.20.26"}, {"source": "security-officer@isc.org", "tags": ["Vendor Advisory"], "url": "https://kb.isc.org/docs/cve-2026-12617"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-617"}], "source": "security-officer@isc.org", "type": "Secondary"}]}

{"bugzilla": {"description": "bind: bind9: Record ordering based unexpected exit with CNAME or DNAME", "id": "2504370", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2504370"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-617", "details": ["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."], "mitigation": {"lang": "en:us", "value": "Upgrade to the patched release most closely related to your current version of BIND 9:\n- 9.20.26\nBIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.\n- 9.20.26-S1"}, "name": "CVE-2026-12617", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "bind9.16", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "bind9.18", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "dhcp", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "impact": "important", "package_name": "bind", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-07-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-12617\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-12617"], "statement": "This Important flaw in BIND can lead to a denial of service in Red Hat products. The `named` daemon may terminate unexpectedly when processing specific CNAME/DNAME and A record query orderings, coupled with precisely timed authoritative server responses. Exploitation requires an attacker to manipulate DNS responses from an authoritative server to a vulnerable resolver.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.18.0,9.18.50]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.20.0,9.20.24]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.18.11-S1,9.18.50-S1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.20.9-S1,9.20.24-S1]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "bind", "vendor": "isc"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.18.0,9.18.50]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.20.0,9.20.24]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.18.11-S1,9.18.50-S1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.20.9-S1,9.20.24-S1]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "BIND 9", "source": "cna", "vendor": "ISC"}, "product": "bind_9", "vendor": "isc"}], "created": "2026-07-23T08:30:04.610761+00:00", "updated": "2026-08-03T23:45:06.003759+00:00", "vendors": ["isc", "isc$PRODUCT$bind", "isc$PRODUCT$bind_9"]}