{"id":"CVE-2026-33489","state":"PUBLISHED","title":"CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison","description":"CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the transfer plugin can select the wrong ACL stanza when both a parent zone and a more-specific subzone are configured. The longestMatch() function in plugin/transfer/transfer.go uses a lexicographic string comparison instead of an actual longest-suffix match to select the winning zone. As a result, a permissive parent-zone transfer rule can override a restrictive subzone rule depending on zone name ordering (e.g., \"example.org.\" > \"a.example.org.\" lexicographically). This allows an unauthorized remote client to perform AXFR/IXFR for the subzone and retrieve its full zone contents. This issue has been fixed in version 1.14.3.","publishedAt":"2026-05-05T19:13:48.461Z","updatedAt":"2026-05-05T19:43:06.361Z","severity":{"score":8.2,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["coredns coredns"],"affected":[{"vendor":"coredns","product":"coredns","versions":[{"version":"< 1.14.3","status":"affected"}]}],"references":["https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3","https://github.com/coredns/coredns/releases/tag/v1.14.3"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/33xxx/CVE-2026-33489.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33489","state":"PUBLISHED","datePublished":"2026-05-05T19:13:48.461Z","dateUpdated":"2026-05-05T19:43:06.361Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-20T16:16:48.971Z"},"containers":{"cna":{"title":"CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison","descriptions":[{"lang":"en","value":"CoreDNS is a DNS server that chains plugins. In versions prior to 1.14.3, the transfer plugin can select the wrong ACL stanza when both a parent zone and a more-specific subzone are configured. The longestMatch() function in plugin/transfer/transfer.go uses a lexicographic string comparison instead of an actual longest-suffix match to select the winning zone. As a result, a permissive parent-zone transfer rule can override a restrictive subzone rule depending on zone name ordering (e.g., \"example.org.\" > \"a.example.org.\" lexicographically). This allows an unauthorized remote client to perform AXFR/IXFR for the subzone and retrieve its full zone contents. This issue has been fixed in version 1.14.3."}],"affected":[{"vendor":"coredns","product":"coredns","versions":[{"version":"< 1.14.3","status":"affected"}]}],"references":[{"url":"https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3","name":"https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/coredns/coredns/releases/tag/v1.14.3","name":"https://github.com/coredns/coredns/releases/tag/v1.14.3","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-05T19:13:48.461Z"},"source":{"advisory":"GHSA-h8mm-c463-wjq3","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-05T19:43:02.806824Z","id":"CVE-2026-33489","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-05T19:43:06.361Z"}}]}}}