What is CVE-2026-94083?

CVE-2026-94083 is a critical-severity vulnerability in Oisf Suricata, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 9.4/10. Published 2026-09-20.

How severe is CVE-2026-94083?

Critical severity. CVSS v3 base score is 9.4 out of 10.

Vulnerability in Oisf Suricata

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 the default in 8.x versions.

Published 2026-09-20 · last modified 2026-09-28.

CVSS v3 metric

CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.005 (45.5th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Oisf Suricata

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

forum.suricata.io/t/suricata-8-0-7-released/6467 (Release Notes)
github.com/OISF/suricata/commit/e574009add9c208f319e1d9d15b3bb1229c88074 (Patch)
github.com/OISF/suricata/compare/suricata-8.0.6...suricata-8.0.7 (Release Notes)

Frequently asked questions

What is CVE-2026-94083?: CVE-2026-94083 is a critical-severity vulnerability in Oisf Suricata, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 9.4/10. Published 2026-09-20.
How severe is CVE-2026-94083?: Critical severity. CVSS v3 base score is 9.4 out of 10.