Resource exhaustion in ISC BIND - CVE-2026-11605
Published: July 23, 2026
Vulnerability identifier: #VU139211
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-11605
CWE-ID: CWE-400
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 cause a denial of service.
The vulnerability exists due to resource exhaustion in DNSSEC validation when processing answers containing many valid but superfluous RRSIG records. A remote attacker can send a query that triggers validation of such records to cause a denial of service.
The issue results in disproportionate CPU consumption during validation.
How to mitigate CVE-2026-11605
Install security update from vendor's website.