CVE-2026-33489

CVE-2026-33489 · CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison

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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.

CVSS 8.2 · Hoch · EPSS 0,4%

Veröffentlicht

2026-05-05T19:13:48.461Z

Aktualisiert

2026-05-05T19:43:06.361Z

Technologie-Stack: network

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