CVE-2026-94083 Memory corruption in Suricata

Critical 9.4 Published 20 Sep 2026 Updated 22 Sep 2026

An attacker can cause a denial of service in Suricata via a type confusion in DoH2 handling that leads to an invalid free.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-94083?

CVE-2026-94083 is a critical memory corruption vulnerability in Oisf Suricata, published on 20 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

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.

Weakness: CWE-843

Which versions are affected by CVE-2026-94083?

It affects 1 product.

Products include Oisf Suricata.

How do I fix CVE-2026-94083?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-94083 being exploited?

There is no known exploitation of CVE-2026-94083 in the wild and no public exploit code.

All Oisf Suricata vulnerabilities

Sources

Also known as DEBIAN-CVE-2026-94083, GHSA-4wwf-734g-mqm8, UBUNTU-CVE-2026-94083.