CVE-2026-77119

Name of the Vulnerable Software and Affected Versions BIND 9 versions 9.11.0 through 9.18.50 BIND 9 versions 9.20.0 through 9.20.27 BIND 9 versions 9.21.0 through 9.21.25 BIND 9 versions 9.11.3-S1 through 9.18.50-S1 BIND 9 versions 9.20.9-S1 through 9.20.27-S1

Description A validly signed NSEC3 (Next Secure record version 3, used in DNSSEC to prove the non-existence of a record) from an unrelated sibling zone may be accepted as an insecurity proof. This allows a secure delegation to be downgraded, which can enable a forged unsigned answer to be accepted.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.