PT-2026-63414 · Isc · Bind 9

CVE-2026-11331 · Published 2026-07-22 · Updated 2026-07-22

NVD

CVSS v3.1

7.5

High

Base vector

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

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.

Fix

Weakness Enumeration

CWE-790

Related Identifiers

CVE-2026-11331

Affected Products

Bind 9

References · 4

• https://downloads.isc.org/isc/bind9/9.21.24 · Patch
• https://downloads.isc.org/isc/bind9/9.20.26 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-11331 · Security Note
• https://kb.isc.org/docs/cve-2026-11331 · Vendor Advisory