CVE-2026-94083

A flaw was found in Suricata's DNS over HTTPS 2 DoH2 application-layer protocol parser. When processing a DoH2 request accompanied by an HTTP/1 to HTTP/2 upgrade, Suricata mistakenly executes HTTP/2 state cleanup logic while the protocol handler is in an HTTP/1 state. A remote, unauthenticated...

Suricata 8.x < 8.0.7 Type Confusion (CVE-2026-94083)

The version of OISF Suricata installed on the remote host is 8.x prior to 8.0.7. It is, therefore, affected by a vulnerability: - 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...

DEBIAN-CVE-2026-94083

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 th...

CVE-2026-94083

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 th...

CVE-2026-94083

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 th...

CVE-2026-94083

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 th...

CVE-2026-94083

Suricata before 8.0.7 is affected by a DoH2 type confusion vulnerability. When a DoH2 request includes an HTTP/1 to HTTP/2 upgrade, the HTTP/2 state cleanup code is executed even though the actual connection state is HTTP/1, leading to an invalid free . The issue requires app-layer.protocols.doh2...

CVE-2026-94083

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 th...

CVE-2026-94083

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 th...

CVE-2026-94083

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 th...

EUVD-2026-83638

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 th...

CVE-2026-94083: Access of Resource Using Incompatible Type

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 th...

PT-2026-95902

Name of the Vulnerable Software and Affected Versions Suricata versions prior to 8.0.7 Description A type confusion exists in the handling of DoH2 DNS over HTTP/2 when a DoH2 request occurs during an HTTP1 to HTTP2 upgrade. This issue occurs because the cleanup code for the HTTP2 state is execute...

Linux Distros Unpatched Vulnerability : CVE-2026-94083

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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 stat...

CVE-2026-71418

Suricata is a network IDS/IPS/NMS engine. Affected versions are 8.0.0 through 8.0.6 . The vulnerability resides in DNS-over-HTTP/2 (DoH2) processing in rust/src/http2/http2.rs, where previously processed HTTP/2 DATA frame contents are retained in the internal buffer instead of being cleared. An a...

CVE-2026-71418 Suricata doh2: crafted HTTP/2 DATA frames can cause quadratic CPU consumption

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, DNS-over-HTTP/2 processing in rust/src/http2/http2.rs retains previously processed HTTP/2 DATA frame contents instead of clearing the internal buffer...

CVE-2026-71418 Suricata doh2: crafted HTTP/2 DATA frames can cause quadratic CPU consumption

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, DNS-over-HTTP/2 processing in rust/src/http2/http2.rs retains previously processed HTTP/2 DATA frame contents instead of clearing the internal buffer...

CVE-2026-71418 Suricata doh2: crafted HTTP/2 DATA frames can cause quadratic CPU consumption

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, DNS-over-HTTP/2 processing in rust/src/http2/http2.rs retains previously processed HTTP/2 DATA frame contents instead of clearing the internal buffer...