---
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 < 8.0.7
patched:
  - suricata 8.0.7
published: '2026-09-20'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T18:30:00.563'
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
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94083.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-94083'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-94083'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94083'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-22T15:19:55.907673Z'
ingestedAt: '2026-09-20T02:12:35.982Z'
epss: 0.0054
epssPercentile: 0.45235
scores:
  nvd: 9.4
  vendor: 9.8
---

## 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.

## Affected

- `suricata < 8.0.7`

## Remediation

Upgrade past the affected range:

- `suricata 8.0.7`

## Vendor advisories

- **Red Hat VEX** · updated 2026-10-02 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94083.json)