High 8.6Published Jul 22, 2026

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

Updated under an hour ago (Oct 28, 2026, 6:00 AM ET)

Does this affect you?

It affects ISC BIND 9. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for ISC BIND 9

Exploited in the last 30 days

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.

CVSS: 8.6 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Weakness (CWE): CWE-346
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: isc
NVD analysis: Undergoing Analysis
Record last updated: Jul 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ISC BIND 9 isc:bind_9 (from the name)	from 9.11.0 through 9.18.50; from 9.20.0 through 9.20.24; from 9.21.0 through 9.21.23; from 9.11.3-S1 through 9.18.50-S1; from 9.20.9-S1 through 9.20.24-S1	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.