Vulnerability · Published Jul 22, 2026 · Assigned by isc
CVE-2026-11622Potential memory usage beyond configured limits
High 7.5
In plain English
A high-severity resource allocation without limits in BIND 9 from ISC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 54.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the `max-cache-size` parameter. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | bind | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:8 | bind | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | bind | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:10 | bind-chroot | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:8 | bind-chroot | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | bind-chroot | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:10 | bind-devel | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:8 | bind-devel | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | bind-devel | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:9 | bind-dnssec-doc | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:10 | bind-dnssec-utils | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:9 | bind-dnssec-utils | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:10 | bind-doc | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:9 | bind-doc | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:8 | bind-export-devel | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-export-libs | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:10 | bind-libs | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:8 | bind-libs | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | bind-libs | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:8 | bind-libs-lite | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:10 | bind-license | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:8 | bind-license | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | bind-license | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:8 | bind-lite-devel | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-pkcs11 | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-pkcs11-devel | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-pkcs11-libs | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-pkcs11-utils | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-sdb | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:8 | bind-sdb-chroot | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:10 | bind-utils | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux:8 | bind-utils | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | bind-utils | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:8 | bind9.16 | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-chroot | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-devel | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-dnssec-utils | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-doc | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-libs | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-license | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:8 | bind9.16-utils | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| AlmaLinux:9 | bind9.18 | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:9 | bind9.18-chroot | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:9 | bind9.18-devel | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:9 | bind9.18-dnssec-utils | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:9 | bind9.18-doc | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:9 | bind9.18-libs | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:9 | bind9.18-utils | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux:8 | python3-bind | 32:9.11.36-16.el8_10.14 | ALSA-2026:54654 |
| AlmaLinux:9 | python3-bind | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux:8 | python3-bind9.16 | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
| Alpine:v3.22 | bind | 9.20.26-r0 | ALPINE-CVE-2026-11622 |
| Alpine:v3.23 | bind | 9.20.26-r0 | ALPINE-CVE-2026-11622 |
| Alpine:v3.24 | bind | 9.20.26-r0 | ALPINE-CVE-2026-11622 |
| Debian:12 | bind9 | 1:9.18.49-1~deb12u2 | DEBIAN-CVE-2026-11622 |
| Debian:13 | bind9 | 1:9.20.26-1~deb13u1 | DEBIAN-CVE-2026-11622 |
| Debian:14 | bind9 | 1:9.20.26-1 | DEBIAN-CVE-2026-11622 |
| Rocky Linux:10 | bind | 2:9.18.33-15.el10_2.10 | RLSA-2026:55437 |
| Rocky Linux:8 | bind | 2:9.11.36-16.el8_10.14 | RLSA-2026:54654 |
| Rocky Linux:9 | bind | 2:9.16.23-40.el9_8.8 | RLSA-2026:54510 |
| Rocky Linux:8 | bind9.16 | 2:9.16.23-0.22.el8_10.12 | RLSA-2026:54509 |
| Rocky Linux:9 | bind9.18 | 2:9.18.29-14.el9_8.8 | RLSA-2026:55442 |
| Ubuntu:22.04:LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.5 | USN-8648-1 |
| Ubuntu:22.04:LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.7 | USN-8929-1 |
| Ubuntu:22.04:LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.5 | UBUNTU-CVE-2026-11622 |
| Ubuntu:24.04:LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.6 | USN-8648-1 |
| Ubuntu:24.04:LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.8 | USN-8929-1 |
| Ubuntu:24.04:LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.6 | UBUNTU-CVE-2026-11622 |
| Ubuntu:26.04:LTS | bind9 | 1:9.20.24-1ubuntu0.2 | USN-8648-1 |
| Ubuntu:26.04:LTS | bind9 | 1:9.20.24-1ubuntu0.4 | USN-8929-1 |
| Ubuntu:26.04:LTS | bind9 | 1:9.20.24-1ubuntu0.2 | UBUNTU-CVE-2026-11622 |
| Ubuntu:22.04:LTS | bind9-libs | no fix listed | UBUNTU-CVE-2026-11622 |
| Ubuntu:24.04:LTS | isc-dhcp | no fix listed | UBUNTU-CVE-2026-11622 |
| Ubuntu:26.04:LTS | isc-dhcp | no fix listed | UBUNTU-CVE-2026-11622 |
Affected products (as reported)
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- CVE-2026-11622 vendor-advisory
- https://downloads.isc.org/isc/bind9/9.20.26 patch
- https://downloads.isc.org/isc/bind9/9.21.24 patch