CVE-2026-11331

HighCVSS 7.5/10Last modified Nov 2, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-790

Affected software

VendorProductVersions
ISCBIND 9>= 9.16.0, <= 9.18.50; >= 9.20.0, <= 9.20.24; >= 9.21.0, <= 9.21.23; >= 9.16.8-S1, <= 9.18.50-S1; >= 9.20.9-S1, <= 9.20.24-S1

References

Timeline

Published
Jul 22, 2026
Last modified
Nov 2, 2026
NVD status
Analyzed

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CVE-2026-11331: High severity, CVSS 7.5 | Vulnix