{"id":"CVE-2026-33489","summary":"CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison","details":"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.\" \u003e \"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.","aliases":["GHSA-h8mm-c463-wjq3"],"modified":"2026-05-28T03:53:14.537878983Z","published":"2026-05-05T19:13:48.461Z","related":["CGA-q7gq-fh35-9fjf","openSUSE-SU-2026:20703-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33489.json","cwe_ids":["CWE-863"],"cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/coredns/coredns/releases/tag/v1.14.3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33489.json"},{"type":"ADVISORY","url":"https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33489"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/coredns/coredns","events":[{"introduced":"0"},{"fixed":"17fceec6d93fd1dde5ba6888c363f131ff6d647f"}]}],"versions":["v1.14.2","v1.14.1","v1.14.0","v1.13.2","v1.13.1","v1.13.0","v1.12.4","v1.12.3","v1.12.2","v1.12.1","v1.12.0","v1.11.4","v1.11.3","v1.11.1","v1.11.0","v1.10.1","v1.10.0","v1.9.4","v1.9.3","v1.9.2","v1.9.1","v1.9.0","v1.8.7","v1.8.6","v1.8.5","v1.8.4","v1.8.3","v1.8.2","v1.8.1","v1.8.0","v1.7.1","v1.7.0","v1.6.9","v1.6.8","v1.6.7","v1.6.6","v1.6.5","v1.6.4","v1.6.3","v1.6.2","v1.6.1","v1.6.0","v1.5.2","v1.5.1","v1.5.0","v1.4.0","v1.3.1","v1.3.0","v1.2.6","v1.2.5","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.1.4","v1.1.3","v1.1.2","v1.1.1","v1.1.0","v1.0.6","v1.0.5","v1.0.3","v1.0.2","v1.0.1","v1.0.0","v0.9.10","v0.9.9","v011","v010","v009","v008","v007","v006","v005","v004","v003","v002","v001"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-33489.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"}]}