CVE-2026-19941

BIND 9 's named resolver contains a flaw in its checkwildcard() function that may accept an inapplicable, out-of-zone NSEC record as proof that no wildcard exists. This allows an attacker positioned at the same or an upstream level of the zone name to mask the existence of a victim's wildcard rec...

EUVD-2026-80745

An inapplicable NSEC record may be accepted by a named resolver as proof that no wildcard exists, which could allow an attacker at the same or an upstream level of the zone name to mask the existence of a victim's wildcard record. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0...

CVE-2026-19941 checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof

An inapplicable NSEC record may be accepted by a named resolver as proof that no wildcard exists, which could allow an attacker at the same or an upstream level of the zone name to mask the existence of a victim's wildcard record. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0...