PT-2026-63419 · Isc · Bind 9

CVE-2026-13204 · Published 2026-07-22 · Updated 2026-07-22

NVD

CVSS v3.1

7.5

High

Base vector

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

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.

Fix

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

CVE-2026-13204

Affected Products

Bind 9

References · 4

• https://downloads.isc.org/isc/bind9/9.21.24 · Patch
• https://downloads.isc.org/isc/bind9/9.20.26 · Patch
• https://kb.isc.org/docs/cve-2026-13204 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-13204 · Security Note