CVE-2026-33489
CVE-2026-33489 · CoreDNS transfer plugin subzone ACL bypass via lexicographic zone comparison
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 · High · EPSS 0.4%
- Published
- Updated
Stack: network
Affected products and versions
coredns
- Versions
- < 1.14.3: Affected
No fix published