CVE-2026-80274

Details

If a BIND resolver sends a query for a DNSSEC-signed authoritative zone, and the authoritative server replies with a valid wildcard answer and signed NSEC3 proof, followed by an unsigned NSEC at the same owner name, it will trigger an unexpected program exit. 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 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

Affected Packages

bind

brew

References

FIX

https://downloads.isc.org/isc/bind9/9.20.29

FIX

https://downloads.isc.org/isc/bind9/9.21.26

ADVISORY

https://kb.isc.org/docs/cve-2026-80274

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-80274