{"api_version":"1","generated_at":"2026-07-23T13:38:53+00:00","cve":"CVE-2026-11331","urls":{"html":"https://cve.report/CVE-2026-11331","api":"https://cve.report/api/cve/CVE-2026-11331.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-11331","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-11331"},"summary":{"title":"Potential wildcard CNAME RPZ policy bypass","description":"An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. 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This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software.\nThis issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-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 such a situation is encountered, the targeted RPZ rule may be bypassed.  The condition could also lead to an unexpected exit."}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-790","description":"CWE-790 Improper Filtering of Special Elements","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-07-22T14:10:44.763Z","orgId":"404fd4d2-a609-4245-b543-2c944a302a22","shortName":"isc"},"references":[{"name":"CVE-2026-11331","tags":["vendor-advisory"],"url":"https://kb.isc.org/docs/cve-2026-11331"},{"tags":["patch"],"url":"https://downloads.isc.org/isc/bind9/9.20.26"},{"tags":["patch"],"url":"https://downloads.isc.org/isc/bind9/9.21.24"}],"solutions":[{"lang":"en","value":"Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26, 9.21.24, or 9.20.26-S1."}],"source":{"discovery":"EXTERNAL"},"title":"Potential wildcard CNAME RPZ policy bypass","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-2026-11331","datePublished":"2026-07-22T14:10:44.763Z","dateReserved":"2026-06-05T07:03:42.361Z","dateUpdated":"2026-07-22T18:54:17.064Z","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-790","CWE-790 CWE-790 Improper Filtering of Special Elements"],"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:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-22T18:54:08.280433Z","id":"CVE-2026-11331","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"11331","Ordinal":"1","Title":"Potential wildcard CNAME RPZ policy bypass","CVE":"CVE-2026-11331","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"11331","Ordinal":"1","NoteData":"An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software.\nThis issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.","Type":"Description","Title":"Potential wildcard CNAME RPZ policy bypass"}]}}}