CVE-2026-77119

BIND 9 (ISC) has a DNSSEC NSEC3 insecure-referral proof flaw: a validly signed NSEC3 RRset from an unrelated sibling zone may be accepted as proof of non-existence, downgrading a secure delegation and allowing a forged unsigned answer through. Affected versions are 9.11.0–9.18.50, 9.20.0–9.20.27,...

CVE-2026-77119 NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets

A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through. 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...