CVE-2026-13321

HIGH

DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field

Title source: cna
STIX 2.1

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.

References (3)

Core 3
Core References
Vendor Advisory vendor-advisory
CVE-2026-13321
https://kb.isc.org/docs/cve-2026-13321

Scores

CVSS v3 8.6
EPSS 0.0022
EPSS Percentile 12.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-346
Status published
Products (5)
ISC/BIND 9 9.11.0 - 9.18.50
ISC/BIND 9 9.11.3-S1 - 9.18.50-S1
ISC/BIND 9 9.20.0 - 9.20.24
ISC/BIND 9 9.20.9-S1 - 9.20.24-S1
ISC/BIND 9 9.21.0 - 9.21.23
Published Jul 22, 2026
Tracked Since Jul 22, 2026