| Name | CVE-2026-11331 |
| Description | 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 | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-4725-1, DSA-6395-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| bind9 (PTS) | bullseye | 1:9.16.50-1~deb11u2 | vulnerable |
| bullseye (security) | 1:9.16.50-1~deb11u6 | fixed | |
| bookworm | 1:9.18.49-1~deb12u1 | vulnerable | |
| bookworm (security) | 1:9.18.49-1~deb12u2 | fixed | |
| trixie | 1:9.20.23-1~deb13u1 | vulnerable | |
| trixie (security) | 1:9.20.26-1~deb13u1 | fixed | |
| forky, sid | 1:9.20.26-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| bind9 | source | bullseye | 1:9.16.50-1~deb11u6 | DLA-4725-1 | ||
| bind9 | source | bookworm | 1:9.18.49-1~deb12u2 | DLA-4725-1 | ||
| bind9 | source | trixie | 1:9.20.26-1~deb13u1 | DSA-6395-1 | ||
| bind9 | source | (unstable) | 1:9.20.26-1 |
https://kb.isc.org/docs/cve-2026-11331
https://gitlab.isc.org/isc-projects/bind9/-/commit/e1c83d27984f10ff929bc54d6ed84b5152be96d5 (9.16-branch)
https://gitlab.isc.org/isc-projects/bind9/-/commit/25b572a6d00f717d7992f154f28b43d2b2ffd0b3 (9.16-branch)
https://gitlab.isc.org/isc-projects/bind9/-/commit/ee2ac186bc5f75f7f3f7049f1a21e9a2014cee59 (9.16-branch)
https://gitlab.isc.org/isc-projects/bind9/-/commit/adc8285d23e2eac6ec463f5dbc5a9596fdd36c60 (9.18-branch)
https://gitlab.isc.org/isc-projects/bind9/-/commit/095b11f20f911f5b8059bdc349b256d6c64ece30 (9.18-branch)
https://gitlab.isc.org/isc-projects/bind9/-/commit/dc328a199f96222e0c30cc20b7b795bfc2c9b2e4 (9.18-branch)