CVE-2026-11605
Unnecessary validation of DNSSEC signed records
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-408 |
| Vendor | isc |
| Product | bind 9 |
| Published | Jul 22, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
ISC / BIND 9
9.20.0 ≤ 9.20.24 9.21.0 ≤ 9.21.23 9.20.9-S1 ≤ 9.20.24-S1