CVE-2026-13204

If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RRSIG for only one of these types, then BIND may exit unexpectedly with an assertion while validating this proof. 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.

Score

CVSS 3.1 7.5 High

Status

Undergoing Analysis - security-officer@isc.org

Published

2026-07-22

Last modified

2026-10-24

Weaknesses

CWE-617

Affected products

• Bind (Isc)

References

• https://kb.isc.org/docs/cve-2026-13204
• https://downloads.isc.org/isc/bind9/9.20.26
• https://downloads.isc.org/isc/bind9/9.21.24