CVE-2026-33489

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.

• CWE-863

• https://github.com/coredns/coredns/releases/tag/v1.14.3Release Notes
• https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3Exploit, Vendor Advisory
• https://github.com/coredns/coredns/security/advisories/GHSA-h8mm-c463-wjq3Exploit, Vendor Advisory

Published

May 5, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

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