CVE-2026-94083: Oisf Suricata

Critical severity, CVSS 9.4. EPSS: 0.5% chance of exploitation in the next 30 days.

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 products

• Oisf Suricata: before 8.0.7 (fixed in 8.0.7)

Published 2026-09-20. Last modified 2026-09-28.