Unnecessary validation of DNSSEC signed records
CVE-2026-11605 is fixed in 6 products on 1 platform, first by bind9 1:9.20.24-1ubuntu0.2, released July 22, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| bind · opensuse-leap 16.0 | 9.20.26-160000.1.1 | OPENSUSE-SU-2026:21489-1 | Jul 30, 2026 |
| bind · sles 15.7 | 9.20.26-150700.3.29.1 | SUSE-SU-2026:3426-1 | Jul 30, 2026 |
| bind9 · Debian 12.15 (bookworm) | 1:9.18.49-1~deb12u2 | DEBIAN-CVE-2026-11605 | Jul 23, 2026 |
| bind9 · Debian 13.5 (trixie) | 1:9.20.26-1~deb13u1 | DEBIAN-CVE-2026-11605 | Jul 23, 2026 |
| bind9 · Debian 14 | 1:9.20.26-1 | DEBIAN-CVE-2026-11605 | Jul 23, 2026 |
| bind9 · Ubuntu 26.04.1 LTS (resolute) | 1:9.20.24-1ubuntu0.2 | bind9 1:9.20.24-1ubuntu0.2 | Jul 22, 2026 |
| bind9-dnsutils · Ubuntu 26.04.1 LTS (resolute) | 1:9.20.24-1ubuntu0.2 | bind9-dnsutils 1:9.20.24-1ubuntu0.2 | Jul 22, 2026 |
| bind9-host · Ubuntu 26.04.1 LTS (resolute) | 1:9.20.24-1ubuntu0.2 | bind9-host 1:9.20.24-1ubuntu0.2 | Jul 22, 2026 |
| bind9-libs · Ubuntu 26.04.1 LTS (resolute) | 1:9.20.24-1ubuntu0.2 | bind9-libs 1:9.20.24-1ubuntu0.2 | Jul 22, 2026 |
| bind9-utils · Ubuntu 26.04.1 LTS (resolute) | 1:9.20.24-1ubuntu0.2 | bind9-utils 1:9.20.24-1ubuntu0.2 | Jul 22, 2026 |
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