This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-11331 →
DEBIAN-CVE-2026-11331
An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG er...
Original description
The description as published by the source.
An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Debian:12
bind9
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.18.49-1~deb12u2"}]}]
Debian:13
bind9
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.20.26-1~deb13u1"}]}]
Debian:14
bind9
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.20.26-1"}]}]
References
- advisory security-tracker.debian.org