CVE-2026-13321 | The BIND resolver accepts validly-signed NSEC records where … | CVSS 8.6 HIGH

Description

The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone. 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-2026-13321
State: PUBLISHED
Assigner: isc
Reserved: 2026-06-25 08:45 UTC
Published: 2026-07-22 14:16 UTC
Last updated: 2026-07-22 14:16 UTC
Primary CWE: CWE-346
CWE-346 Origin Validation Error
Vendor / Product: ISC / BIND 9
Sources: cve.org · NVD

Severity & Metrics

8.6 HIGH CVSS 3.1

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

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-346	cna	CWE-346 Origin Validation Error

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.6	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

References (3)