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

critical Nessus Plugin ID 350171

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Synopsis

An IDS/IPS solution running on the remote host is affected by a type confusion vulnerability.

Description

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 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. (CVE-2026-94083)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade Suricata to version 8.0.7 or higher.

Plugin Details

Severity: Critical

ID: 350171

File Name: suricata_8_0_7_94083.nasl

Version: 1.1

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 9/25/2026

Updated: 9/25/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.5

Percentile: 57.67

CVSS v2

Risk Factor: High

Base Score: 9.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:P

CVSS Score Source: CVE-2026-94083

CVSS v3

Risk Factor: Critical

Base Score: 9.4

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Vulnerability Information

CPE: cpe:/a:oisf:suricata

Required KB Items: installed_sw/Open Information Security Foundation Suricata

Patch Publication Date: 9/15/2026

Vulnerability Publication Date: 9/20/2026

Reference Information

CVE: CVE-2026-94083

IAVB: 2026-B-0274

Detections

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