Improper Check or Handling of Exceptional Conditions in ISC BIND - CVE-2026-11331
Published: July 23, 2026
Vulnerability identifier: #VU139212
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-11331
CWE-ID: CWE-703
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: ISC
Affected software:
ISC BIND
ISC BIND
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass RPZ rules.
The vulnerability exists due to improper error handling in RPZ processing when processing sufficiently long query names that trigger a NAMETOOLONG condition with wildcard CNAME policies. A remote attacker can send a crafted query name to bypass RPZ rules.
The issue only affects resolvers that use RPZ with wildcard CNAME policies.
How to mitigate CVE-2026-11331
Install security update from vendor's website.