CVE-2026-11605
Fixed in a distro release EPSS <1%CVSS 7.5
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.
Products: ISC BIND 9
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.22 | bind | 9.20.26-r0 |
| Alpine 3.23 | bind | 9.20.26-r0 |
| Alpine 3.24 | bind | 9.20.26-r0 |
| Debian 12 | bind9 | 1:9.18.49-1~deb12u2 |
| Debian 13 | bind9 | 1:9.20.26-1~deb13u1 |
| Debian 14 | bind9 | 1:9.20.26-1 |
| Red Hat hummingbird 1 | bind | 0:9.18.50-22.hum1 |
| Red Hat hummingbird 1 | bind-chroot | 0:9.18.50-22.hum1 |
| Red Hat hummingbird 1 | bind-devel | 0:9.18.50-22.hum1 |
| Red Hat hummingbird 1 | bind-dnssec-utils | 0:9.18.50-22.hum1 |
| Red Hat hummingbird 1 | bind-doc | 0:9.18.50-22.hum1 |
| Red Hat hummingbird 1 | bind-libs | 0:9.18.50-22.hum1 |
| Red Hat hummingbird 1 | bind-utils | 0:9.18.50-22.hum1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | bind | 9.20.26-150700.3.29.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | bind | 9.20.26-150700.3.29.1 |
| Ubuntu 22.04 LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.5 |
| Ubuntu 24.04 LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.6 |
| Ubuntu 26.04 LTS | bind9 | 1:9.20.24-1ubuntu0.2 |
| openSUSE Leap 16.0 | bind | 9.20.26-160000.1.1 |
| openSUSE Tumbleweed | bind | 9.20.26-1.1 |