CVE-2026-11605 | The issue is a resource exhaustion vulnerability associated … | CVSS 7.5 HIGH

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.

Metadata

CVE ID: CVE-2026-11605
State: PUBLISHED
Assigner: isc
Reserved: 2026-06-08 15:26 UTC
Published: 2026-07-22 14:11 UTC
Last updated: 2026-07-22 14:11 UTC
Primary CWE: CWE-408
CWE-408 Incorrect Behavior Order - Early Amplification
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:N/I:N/A:H

Affected products (1)

Vendor	Product	Platform	Versions
ISC	BIND 9	—	9.20.0 ≤ 9.20.24, 9.21.0 ≤ 9.21.23, 9.20.9-S1 ≤ 9.20.24-S1

Weakness (CWE)

CWE	Source	Description
CWE-408	cna	CWE-408 Incorrect Behavior Order - Early Amplification

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:N/I:N/A:H

References (3)