CVE-2026-11331 | An attacker who knows (or guesses) that a resolver uses RPZ … | CVSS 7.5 HIGH

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.

Metadata

CVE ID: CVE-2026-11331
State: PUBLISHED
Assigner: isc
Reserved: 2026-06-05 07:03 UTC
Published: 2026-07-22 14:10 UTC
Last updated: 2026-07-22 14:10 UTC
Primary CWE: CWE-790
CWE-790 Improper Filtering of Special Elements
Vendor / Product: ISC / BIND 9
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
ISC	BIND 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 …

Weakness (CWE)

CWE	Source	Description
CWE-790	cna	CWE-790 Improper Filtering of Special Elements

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References (3)