Vulnerability · Published Sep 16, 2026 · Assigned by isc
CVE-2026-77692Unauthenticated remote crash of named via a single DoH SIG(0) request
High 7.5
In plain English
A high-severity null pointer dereference 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 6.6% (higher than 94% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)6.6%top 6.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An attacker can cause `named` to abort by sending a crafted DNS-over-HTTPS request with a cryptographically invalid SIG(0) record, and then closing the transport connection prematurely. This issue affects BIND 9 versions 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and 9.20.9-S1 through 9.20.27-S1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.22 | bind | 9.20.29-r0 | ALPINE-CVE-2026-77692 |
| Alpine:v3.23 | bind | 9.20.29-r0 | ALPINE-CVE-2026-77692 |
| Alpine:v3.24 | bind | 9.20.29-r0 | ALPINE-CVE-2026-77692 |
| Debian:12 | bind9 | no fix listed | DEBIAN-CVE-2026-77692 |
| Debian:13 | bind9 | 1:9.20.29-1~deb13u1 | DEBIAN-CVE-2026-77692 |
| Debian:14 | bind9 | 1:9.20.29-1 | DEBIAN-CVE-2026-77692 |
| Ubuntu:22.04:LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.7 | USN-8929-1 |
| Ubuntu:22.04:LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.8 | USN-8969-1 |
| Ubuntu:24.04:LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.8 | USN-8929-1 |
| Ubuntu:24.04:LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.9 | USN-8969-1 |
| Ubuntu:26.04:LTS | bind9 | 1:9.20.24-1ubuntu0.5 | USN-8969-1 |
| Ubuntu:26.04:LTS | bind9 | 1:9.20.24-1ubuntu0.4 | USN-8929-1 |
| Ubuntu:26.04:LTS | bind9 | 1:9.20.24-1ubuntu0.4 | UBUNTU-CVE-2026-77692 |
| Ubuntu:26.10 | bind9 | 1:9.20.24-1ubuntu3.1 | UBUNTU-CVE-2026-77692 |
| Ubuntu:26.10 | bind9 | 1:9.20.24-1ubuntu3.1 | USN-8969-1 |
| Ubuntu:22.04:LTS | bind9-libs | no fix listed | UBUNTU-CVE-2026-77692 |
| Ubuntu:24.04:LTS | isc-dhcp | no fix listed | UBUNTU-CVE-2026-77692 |
| Ubuntu:26.04:LTS | isc-dhcp | no fix listed | UBUNTU-CVE-2026-77692 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- CVE-2026-77692 vendor-advisory
- https://downloads.isc.org/isc/bind9/9.20.29 patch
- https://downloads.isc.org/isc/bind9/9.21.26 patch