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CVE-2026-77119 is a DNSSEC validation flaw in BIND 9 handling of NSEC3 insecure-referral proofs. A validly signed cached NSEC3 RRset belonging to an unrelated sibling zone can be incorrectly accepted as proof that a delegation is insecure. This permits downgrading of a secure delegation and acceptance of a forged unsigned DNS answer. 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 corresponding affected Supported Preview Edition releases.
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A BIND 9 DNSSEC validation vulnerability in which a validly signed NSEC3 record from an unrelated sibling zone can be accepted as an insecurity proof. This can downgrade a secure delegation and allow a forged unsigned DNS answer to be accepted.
A medium-severity remotely exploitable BIND 9 DNSSEC validation flaw in which an unrelated sibling zone's cached, validly signed NSEC3 record can be accepted as an insecurity proof. This can downgrade a secure delegation, permit forged unsigned DNS responses, and enable DNS cache poisoning through false delegations to an unsigned zone.
A publicly disclosed, unpatched vulnerability tracked as CVE-2026-77119 affecting Debian Linux versions 12.0, 13.0, and 14.0. The provided CVSS v3 vector indicates network reachability, high attack complexity, no privileges or user interaction required, and high integrity impact.
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Cross-references every affected SKU, including bundled OEM variants.
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