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 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.
- Score
- CVSS 3.1 7.5 High
- Status
- Undergoing Analysis - security-officer@isc.org
- Published
- 2026-07-22
- Last modified
- 2026-10-24
- Weaknesses
- CWE-790
Affected products
References
- https://kb.isc.org/docs/cve-2026-11331
- https://downloads.isc.org/isc/bind9/9.20.26
- https://downloads.isc.org/isc/bind9/9.21.24
