CVE-2026-19666

Name of the Vulnerable Software and Affected Versions BIND 9 versions 9.11.0 through 9.18.50 BIND 9 versions 9.20.0 through 9.20.27 BIND 9 versions 9.21.0 through 9.21.25 BIND 9 versions 9.11.3-S1 through 9.18.50-S1 BIND 9 versions 9.20.9-S1 through 9.20.27-S1

Description A use-after-free issue exists in the query addnoqnameproof() function via the DNS64 filter64 path. When a resolver is configured to use dns64, a specifically malformed answer from an authoritative server can cause the named process to exit unexpectedly.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.