CVE-2026-13321 — DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field

CVE-2026-13321

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

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
ISC / BIND 9	affected 9.11.0 through 9.18.50; affected 9.20.0 through 9.20.24; affected 9.21.0 through 9.21.23; affected 9.11.3-S1 through 9.18.50-S1; affected 9.20.9-S1 through 9.20.24-S1

CWE

CWE-346

References

https://kb.isc.org/docs/cve-2026-13321
https://downloads.isc.org/isc/bind9/9.20.26
https://downloads.isc.org/isc/bind9/9.21.24

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.