---
id: CVE-2026-94083
title: >-
  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)
summary: >-
  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). Thi…
severity: critical
cvss: 9.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L'
cwe:
  - CWE-843
vendor: OISF
product: Suricata
affected:
  - Suricata >= 8.0.0 < 8.0.7
published: '2026-09-20'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:44:52.447'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94083'
references:
  - url: 'https://forum.suricata.io/t/suricata-8-0-7-released/6467'
    label: cve@mitre.org
  - url: >-
      https://github.com/OISF/suricata/commit/e574009add9c208f319e1d9d15b3bb1229c88074
    label: cve@mitre.org
  - url: 'https://github.com/OISF/suricata/compare/suricata-8.0.6...suricata-8.0.7'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
epss: 0.0054
epssPercentile: 0.43034
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-22T15:19:55.907673Z'
ingestedAt: '2026-09-20T02:12:35.982Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.