Vulnerability · Published Jul 22, 2026 · Assigned by isc
CVE-2026-10822Key Record using PRIVATEDNS algorithm may lead to unexpected exit
Medium 6.5
In plain English
A medium-severity security flaw 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 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
If BIND encounters a particular invalid data structure in a DNS record, it will accept the invalid data, and may subsequently abort and exit. BIND will first need to store a DNS record for a key (KEY, DNSKEY, etc.). That key must specify a PRIVATEDNS algorithm (253), and in the algorithm identifier, improperly give a length longer than the actual identifier data. The invalid identifier will be stored. If BIND later needs to render that record to text, it will use the invalid length during processing, leading to a consistency check failing. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.18.11-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 |
|---|---|---|---|
| Alpine:v3.22 | bind | 9.20.26-r0 | ALPINE-CVE-2026-10822 |
| Alpine:v3.23 | bind | 9.20.26-r0 | ALPINE-CVE-2026-10822 |
| Alpine:v3.24 | bind | 9.20.26-r0 | ALPINE-CVE-2026-10822 |
| Debian:12 | bind9 | 1:9.18.49-1~deb12u2 | DEBIAN-CVE-2026-10822 |
| Debian:13 | bind9 | 1:9.20.26-1~deb13u1 | DEBIAN-CVE-2026-10822 |
| Debian:14 | bind9 | 1:9.20.26-1 | DEBIAN-CVE-2026-10822 |
| 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-2026-10822 |
| 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-2026-10822 |
| Ubuntu:24.04:LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.6 | 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 | USN-8648-1 |
| Ubuntu:26.04:LTS | bind9 | 1:9.20.24-1ubuntu0.2 | UBUNTU-CVE-2026-10822 |
| Ubuntu:22.04:LTS | bind9-libs | no fix listed | UBUNTU-CVE-2026-10822 |
| Ubuntu:24.04:LTS | isc-dhcp | no fix listed | UBUNTU-CVE-2026-10822 |
| Ubuntu:26.04:LTS | isc-dhcp | no fix listed | UBUNTU-CVE-2026-10822 |
Affected products (as reported)
Weakness: CWE-617, CWE-1284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- CVE-2026-10822 vendor-advisory
- https://downloads.isc.org/isc/bind9/9.20.26 patch
- https://downloads.isc.org/isc/bind9/9.21.24 patch