CVE-2026-11605
highThe issue is a resource exhaustion vulnerability associated with DNSSEC validation.
Vendor / product: Isc — bind
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.
CVSS
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (security-officer@isc.org)
Timeline (UTC)
Published: 2026-07-22 15:16
Modified: 2026-11-02 17:44
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-11-03 07:34 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
isc / bind ≥9.20.0 ≤9.20.24, ≥9.20.9 ≤9.20.24, ≥9.21.0 ≤9.21.23
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://kb.isc.org/docs/cve-2026-11605
References
- https://downloads.isc.org/isc/bind9/9.20.26 security-officer@isc.org
- https://downloads.isc.org/isc/bind9/9.21.24 security-officer@isc.org
- https://kb.isc.org/docs/cve-2026-11605 security-officer@isc.org
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 07:34 UTC · record ↗