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CVE-2026-19941 is an improper DNSSEC proof-validation flaw in BIND 9 named resolvers. The resolver's checkwildcard() logic can accept an out-of-zone or otherwise inapplicable NSEC record as proof that no wildcard record exists. This permits an attacker positioned at the same level as, or an upstream level of, the target zone name to make the resolver incorrectly conclude that a victim wildcard DNS record is absent. Affected versions include BIND 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and the corresponding affected Supported Preview Edition releases.
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A BIND 9 `named` resolver flaw in which an inapplicable DNSSEC NSEC record can be accepted as proof that a wildcard record does not exist, enabling an attacker at the same or upstream zone level to mask a victim wildcard DNS record.
A medium-severity remote BIND 9 resolver flaw in checkwildcard() that accepts an out-of-zone or otherwise inapplicable NSEC record as proof that a wildcard does not exist. An attacker controlling a same-level or upstream zone may suppress a victim wildcard mapping and cause cache poisoning.
An unpatched vulnerability affecting Debian Linux 12.0, 13.0, and 14.0. The supplied CVSS v3.0 vector indicates network reachability, high attack complexity, no privileges or user interaction required, and an integrity impact only.
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Cross-references every affected SKU, including bundled OEM variants.
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