PT-2026-63415 · Isc · Bind 9

CVE-2026-11605 · Published 2026-07-22 · Updated 2026-07-22

Mitre

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 a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to waste disproportionate CPU time. This issue affects BIND 9 versions 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, and 9.20.9-S1 through 9.20.24-S1.

Fix

Weakness Enumeration

CWE-408

Related Identifiers

CVE-2026-11605

Affected Products

Bind 9

References · 4

• https://kb.isc.org/docs/cve-2026-11605 · Vendor Advisory
• https://downloads.isc.org/isc/bind9/9.21.24 · Patch
• https://downloads.isc.org/isc/bind9/9.20.26 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-11605 · Security Note