CVE-2026-11605

Published: Jul 22, 2026Modified: Jul 22, 2026

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: security-officer@isc.org (Secondary)

Description

The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to waste disproportionate CPU time. This issue affects BIND 9 versions 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, and 9.20.9-S1 through 9.20.24-S1.

Related CWEs

CWE-408

Incorrect Behavior Order: Early Amplification

The product allows an entity to perform a legitimate but expensive operation before authentication or authorization has taken place.

References (3)

https://downloads.isc.org/isc/bind9/9.20.26

Source: security-officer@isc.org

https://downloads.isc.org/isc/bind9/9.21.24

Source: security-officer@isc.org

https://kb.isc.org/docs/cve-2026-11605

Source: security-officer@isc.org

Timeline

No history available yet.