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CVE-2026-80274 is a remotely exploitable denial-of-service vulnerability in BIND 9 DNSSEC-validating resolvers. When processing a response for a DNSSEC-signed authoritative zone, the resolver can exit unexpectedly if it receives a valid wildcard answer with a signed NSEC3 proof followed by an unsigned NSEC record at the same owner name. The malformed proof combination causes the resolver to abort while caching a mismatched NOQNAME proof. 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 high-severity remotely exploitable BIND 9 denial-of-service vulnerability associated with mismatched NOQNAME proof handling.
A denial-of-service vulnerability in BIND DNS resolvers: a specially constructed DNSSEC response combining a valid wildcard answer and signed NSEC3 proof with an unsigned NSEC record at the same owner name causes an unexpected program exit.
A high-severity, remotely exploitable denial-of-service vulnerability in BIND 9's validating resolver. A crafted DNS response sequence involving a valid wildcard answer, signed NSEC3 proof, and unsigned NSEC record at the same owner name can abort the resolver process.
An unpatched remotely reachable denial-of-service vulnerability affecting BIND 9 on Debian Linux 12.0, 13.0, and 14.0. The supplied CVSS v3 vector indicates low-complexity, unauthenticated network exploitation with no user interaction and impact limited to availability.
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