CVE-2026-78301

Summary

A malformed zone may contain an NS or DNAME node above its origin, which named treats as a zone cut. If an attacker inserts a malformed zone into a BIND authoritative server (e.g., via zone transfer), queries for names inside the configured zone then lose authoritative status and return an out-of-zone delegation. On a server that also provides recursion BIND can follow this locally sourced cut and cache attacker-supplied data, affecting names outside the configured zone. This situation persists as long as the malformed zone remains in the zone database. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

Affected Software

VendorProductVersion RangeStatus
ISCBIND 99.11.0 <= 9.18.50affected
ISCBIND 99.20.0 <= 9.20.27affected
ISCBIND 99.21.0 <= 9.21.25affected
ISCBIND 99.11.3-S1 <= 9.18.50-S1affected
ISCBIND 99.20.9-S1 <= 9.20.27-S1affected

Weaknesses

  • CWE-349: CWE-349 Acceptance of Extraneous Untrusted Data With Trusted Data

Workarounds

No workarounds known.

References