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VULNERABILITIES

CVE-2026-11331 Details

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.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://downloads.isc.org/isc/bind9/9.20.26 [email protected]
https://downloads.isc.org/isc/bind9/9.21.24 [email protected]
https://kb.isc.org/docs/cve-2026-11331 [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-790Improper Filtering of Special Elements[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-11331
NVD Published Date:
Jul 22, 2026
NVD Last Modified:
Jul 22, 2026
Source:
[email protected]
CVE-2026-11331 Details - Not Deferred