CVE-2026-11622 | A DNSSEC validating resolver that is under a random subdomai… | CVSS 7.5 HIGH

Description

A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the `max-cache-size` parameter. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

Metadata

CVE ID: CVE-2026-11622
State: PUBLISHED
Assigner: isc
Reserved: 2026-06-08 20:17 UTC
Published: 2026-07-22 14:12 UTC
Last updated: 2026-07-22 14:12 UTC
Primary CWE: CWE-770
CWE-770 Allocation of Resources Without Limits or Throttling
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	—	9.11.0 ≤ 9.18.50, 9.20.0 ≤ 9.20.24, 9.21.0 ≤ 9.21.23, 9.11.3-S1 ≤ 9.18.50-S1 …

Weakness (CWE)

CWE	Source	Description
CWE-770	cna	CWE-770 Allocation of Resources Without Limits or Throttling

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)