{"id":"GHSA-h8mm-c463-wjq3","revision":null,"records":[{"revision":"bd0ae1440a9e422d9aa9fcdb17620308","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-33489","aliases":[],"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.","state":0,"publishedAt":"2026-05-05T19:13:48.461+00:00","modifiedAt":"2026-05-05T19:43:06.361+00:00","affected":[{"ecosystem":"Vendor product","name":"coredns","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"coredns\",\n                    \"product\": \"coredns\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.14.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 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","score":8.2,"severity":"HIGH"}],"references":["https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3","https://github.com/coredns/coredns/releases/tag/v1.14.3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-33489","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-33489","identifiers":["CVE-2026-33489"]},"retained":false,"historicalAffected":[]},{"revision":"3ed9e744b8ff4a18b7b8db2b23f4fe90","observedAt":"2026-11-15T10:03:29.597+00:00","statement":{"source":"euvd","id":"EUVD-2026-27450","aliases":["CVE-2026-33489","GHSA-h8mm-c463-wjq3"],"title":"CoreDNS is a DNS server that chains plugins. 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This issue has been fixed in version 1.14.3.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 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","score":8.2,"severity":null}],"references":["https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3","https://github.com/coredns/coredns/releases/tag/v1.14.3"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-27450","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 5, 2026, 7:13:48 PM","dateUpdated":"May 5, 2026, 7:43:06 PM"},"relatedAdvisories":[{"id":"msrc_CVE-2026-33489","title":"CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison","vulnerabilityIds":["CVE-2026-33489"]},{"id":"WID-SEC-W-2026-1283","title":"CoreDNS: Mehrere Schwachstellen ermöglichen","vulnerabilityIds":["CVE-2026-33190","CVE-2026-33489","CVE-2026-35579","CVE-2026-32934","CVE-2026-32936"]},{"id":"openSUSE-SU-2026:20703-1","title":"Security update for coredns","vulnerabilityIds":["CVE-2026-27140","CVE-2026-27143","CVE-2026-27144","CVE-2026-32282","CVE-2026-32283","CVE-2026-32288","CVE-2026-32289","CVE-2026-32934","CVE-2026-32936","CVE-2026-33190","CVE-2026-33489","CVE-2026-33810","CVE-2026-35579"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-27450","identifiers":["EUVD-2026-27450","CVE-2026-33489","GHSA-h8mm-c463-wjq3"]},"retained":false,"historicalAffected":[]},{"revision":"6f1329996beb4939bf912739e2cddd3f","observedAt":"2026-10-25T08:17:24.447+00:00","statement":{"source":"nvd","id":"CVE-2026-33489","aliases":[],"title":"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…","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. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-33489","identifiers":["CVE-2026-33489"]},"retained":false,"historicalAffected":[]},{"revision":"84bc0cc7b67440c3be73d6c4d1a1dbf9","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-h8mm-c463-wjq3","aliases":["CVE-2026-33489","GO-2026-5417"],"title":"CoreDNS' transfer stanza selection uses lexicographic compare (subzone ACL bypass)","description":"### Summary\nCoreDNS' transfer plugin can select the wrong ACL stanza when both a parent zone and a more-specific subzone are configured. A permissive parent-zone transfer rule can override a restrictive subzone rule (name-dependent), allowing an unauthorized client to perform AXFR/IXFR for the subzone and retrieve its zone contents.\n\n### Details\nIn plugin/transfer/transfer.go, stanza selection is implemented by longestMatch(), which is documented as \"longest zone match wins\", but it actually chooses the winner via a lexicographic string comparison:\n- zone := \"\" // longest zone match wins (plugin/transfer/transfer.go)\n- if z > zone { zone = z; x = xfr } (plugin/transfer/transfer.go)\n\nSo, a parent zone like example.org. can beat a child zone like a.example.org. purely due to lexicographic ordering (\"example.org.\" > \"a.example.org.\"), even though the child zone is the longer/more specific suffix match. The bypass is data-dependent (some child labels will win, some will lose), making it operationally non-intuitive.\n\n### PoC\n1. Adjust COREDNS_BIN in the PoC to point at right path (see the top-level const definitions for tunables as well)\n2. Run python3 ./acl-repro.py\n3. Expected output:\n*** Baseline (only subzone transfer rule) ***\naxfr a.example.org.: rcode=5 ancount=0 (expected REFUSED=5)\n\n*** Candidate (add permissive parent transfer rule) ***\naxfr a.example.org.: rcode=0 ancount=5 (expected NOERROR=0 with ancount>0)\n\n*** OK ***\nSubzone transfer ACL bypass reproduced: adding a permissive parent-zone stanza can override a stricter child-zone stanza due to lexicographic zone selection.\n\n### Impact\nUnauthorized zone transfer can expose full zone contents to a remote network client that was intended to be denied by a subzone-specific transfer policy.","state":0,"publishedAt":"2026-04-28T22:44:39+00:00","modifiedAt":"2026-09-10T03:50:44.3880844+00:00","affected":[{"ecosystem":"Go","name":"github.com/coredns/coredns","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.14.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":null,"severity":null},{"system":"CVSS_V4","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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3","https://nvd.nist.gov/vuln/detail/CVE-2026-33489","https://github.com/coredns/coredns","https://github.com/coredns/coredns/releases/tag/v1.14.3"],"sourceUrl":"https://github.com/advisories/GHSA-h8mm-c463-wjq3","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-h8mm-c463-wjq3","identifiers":["GHSA-h8mm-c463-wjq3","CVE-2026-33489","GO-2026-5417"]},"retained":false,"historicalAffected":[]},{"revision":"d4c297a8a86243208a35fbc7cfcdeb72","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5417","aliases":["CVE-2026-33489","GHSA-h8mm-c463-wjq3"],"title":"CoreDNS' transfer stanza selection uses lexicographic compare (subzone ACL bypass) in github.com/coredns/coredns","description":"CoreDNS' transfer stanza selection uses lexicographic compare (subzone ACL bypass) in github.com/coredns/coredns","state":0,"publishedAt":"2026-06-25T22:34:31+00:00","modifiedAt":"2026-06-25T23:00:16.224085+00:00","affected":[{"ecosystem":"Go","name":"github.com/coredns/coredns","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.14.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3","https://nvd.nist.gov/vuln/detail/CVE-2026-33489","https://github.com/coredns/coredns/releases/tag/v1.14.3"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5417","license":"OSV · upstream source license applies","key":"osv:GO-2026-5417","identifiers":["GO-2026-5417","CVE-2026-33489","GHSA-h8mm-c463-wjq3"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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