CVE-2026-11331

Published: Jul 22, 2026Modified: Jul 22, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploitability: 3.9 / Impact: 3.6

Source: security-officer@isc.org (Secondary)

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.

Related CWEs

CWE-790

Improper Filtering of Special Elements

The product receives data from an upstream component, but does not filter or incorrectly filters special elements before sending it to a downstream component.

References (3)

https://downloads.isc.org/isc/bind9/9.20.26

Source: security-officer@isc.org

https://downloads.isc.org/isc/bind9/9.21.24

Source: security-officer@isc.org

https://kb.isc.org/docs/cve-2026-11331

Source: security-officer@isc.org

Timeline

No history available yet.