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CVE-2026-94083 is a type-confusion vulnerability in Suricata versions before 8.0.7 affecting DoH2 processing. When handling a DoH2 request that performs an HTTP/1-to-HTTP/2 upgrade, Suricata can invoke cleanup code for an HTTP/2 state object even though the connection's actual state remains HTTP/1. This incompatible state handling results in an invalid free.
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A type-confusion and invalid-free vulnerability in Suricata's DoH2 handling prior to version 8.0.7. It can occur during an HTTP/1-to-HTTP/2 upgrade involving a DoH2 request, when HTTP/2 cleanup executes against an actual HTTP/1 state. DoH2 application-layer protocol support is enabled by default in Suricata 8.x.
A type-confusion vulnerability (CWE-843) in Suricata's DoH2 processing before version 8.0.7. A DoH2 request involving an HTTP/1-to-HTTP/2 upgrade can cause HTTP/2 cleanup code to run against an HTTP/1 state, resulting in an invalid free. The issue requires the app-layer.protocols.doh2 feature to be enabled, which is enabled by default in Suricata 8.x.
A network-exploitable vulnerability affecting Debian Linux 13.0 and its Suricata package, rated CVSS 3.0 9.4 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L).
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Cross-references every affected SKU, including bundled OEM variants.
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