PT-2026-63418 · Isc · Bind 9

CVE-2026-12617 · 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

The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, named may quit unexpectedly. Or, if a client queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds positively to the A query but delays the CNAME response and later responds with a self-referential CNAME, the same failure may occur. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.18.11-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-2026-12617

Affected Products

Bind 9

References · 3

• https://downloads.isc.org/isc/bind9/9.20.26 · Patch
• https://kb.isc.org/docs/cve-2026-12617 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-12617 · Security Note