VDB
CVE-2026-11605
CVE-2026-11605
PUBLISHED
CVSS 7.5 HIGH
Reported by isc · Published July 22, 2026
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.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| ISC | BIND 9 | 9.20.0, 9.21.0, 9.20.9-S1 |
| ISC | BIND 9 | 9.20.0, 9.21.0, 9.20.9-S1 |
| isc | bind | 9.20.0, 9.21.0, 9.20.9-S1 |
| alpine | bind | 0, 0, 0 |
Timeline
- Jul 22, 2026 Coalition ESS Score
- Jul 22, 2026 CVE Published
- Jul 22, 2026 CVE Updated
- Jul 23, 2026 Security Advisory
- Jul 25, 2026 EPSS Score
References
- CVE-2026-11605 vendor-advisory
- patch
- patch