Vulnerability · Published Sep 20, 2026 · Assigned by mitre
CVE-2026-94083
Critical 9.4
In plain English
A critical-severity type confusion in Suricata from OISF. 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.
Official description
Suricata before 8.0.7 has a DoH2 type confusion that can cause an invalid free, because cleanup code for the HTTP2 state is executed even though the actual state is HTTP1 (when there is a DoH2 request with an HTTP1 to HTTP2 upgrade). This requires app-layer.protocols.doh2 to be enabled, which is the default in 8.x versions.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | suricata | no fix listed | DEBIAN-CVE-2026-94083 |
| Debian:14 | suricata | 1:8.0.7-1 | DEBIAN-CVE-2026-94083 |
| Ubuntu:22.04:LTS | suricata | no fix listed | UBUNTU-CVE-2026-94083 |
| Ubuntu:24.04:LTS | suricata | no fix listed | UBUNTU-CVE-2026-94083 |
| Ubuntu:26.04:LTS | suricata | no fix listed | UBUNTU-CVE-2026-94083 |
| Ubuntu:26.10 | suricata | no fix listed | UBUNTU-CVE-2026-94083 |
Affected products (as reported)
Weakness: CWE-843 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L