PT-2026-63420 · Isc · Bind 9

CVE-2026-13321 · Published 2026-07-22 · Updated 2026-07-22

Mitre

CVSS v3.1

8.6

High

Base vector

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

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.

Fix

Origin Validation Error

Weakness Enumeration

CWE-346

Related Identifiers

CVE-2026-13321

Affected Products

Bind 9

References · 4

• https://kb.isc.org/docs/cve-2026-13321 · Vendor Advisory
• https://downloads.isc.org/isc/bind9/9.21.24 · Patch
• https://downloads.isc.org/isc/bind9/9.20.26 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-13321 · Security Note