high7.5
CVE-2026-11605
The issue is a resource exhaustion vulnerability associated with DNSSEC validation.
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| 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. |
Versions were read from the advisory text. No structured product data has been published for this record yet.