CVE-2026-94083

Suricata before 8.0.7 has a DoH2 type confusion that can cause an invalid free, because cleanup...

9.4 CriticalFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: Low

Exploit likelihood

0.54%Up 0.1 points since Sep 20, 2026

What each source reports

CVE List Score used 9.4

Record: CVE-2026-94083
CVSS 3.1: 9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Weakness: CWE-843
Updated: 2026-11-02

EUVDEUVD-2026-83638 9.4

Record: EUVD-2026-83638
CVSS 3.1: 9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Updated: 2026-11-02

GitHub AdvisoriesGHSA-4wwf-734g-mqm8 9.4

Suricata before 8.0.7 has a DoH2 type confusion that can cause an invalid free, because cleanup...

Record: GHSA-4wwf-734g-mqm8
CVSS 3.1: 9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Weakness: CWE-843
Updated: 2026-11-02

NVD 9.4

Record: CVE-2026-94083
CVSS 3.1: 9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Weakness: CWE-843
Updated: 2026-11-02

OSV 9.4

Record: CVE-2026-94083
CVSS 3.1: 9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Weakness: CWE-843
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-94083 9.4

Record: DEBIAN-CVE-2026-94083
CVSS 3.1: 9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-94083 9.4

Record: UBUNTU-CVE-2026-94083
CVSS 3.1: 9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Updated: 2026-11-02

Affected products

oisf suricata

Affected packages

Affected packages
Package	Affected	Fixed
`suricata` Debian:13	All versions, plus listed versions 1:7.0.10-11:7.0.10-1+deb13u11:7.0.10-1+deb13u21:7.0.10-1+deb13u31:7.0.10-1+deb13u4 Show 24 moreShow less 1:7.0.11-11:7.0.11-1~bpo13+11:8.0.0-1~exp11:8.0.0-1~exp21:8.0.0-1~exp41:8.0.0-1~exp51:8.0.1-11:8.0.1-21:8.0.1-31:8.0.1-3~bpo13+11:8.0.2-11:8.0.2-1~bpo13+11:8.0.3-11:8.0.3-1~bpo13+11:8.0.3-2~exp11:8.0.4-11:8.0.4-1~bpo13+11:8.0.5-11:8.0.5-1~bpo13+11:8.0.6-11:8.0.6-1~bpo13+11:8.0.7-11:8.0.7-1~bpo13+11:8.0.7-2~exp1	None known
`suricata` Debian:14	before 1:8.0.7-1, plus listed versions 1:7.0.10-11:7.0.11-11:7.0.11-1~bpo13+11:8.0.0-1~exp11:8.0.0-1~exp2 Show 18 moreShow less 1:8.0.0-1~exp41:8.0.0-1~exp51:8.0.1-11:8.0.1-21:8.0.1-31:8.0.1-3~bpo13+11:8.0.2-11:8.0.2-1~bpo13+11:8.0.3-11:8.0.3-1~bpo13+11:8.0.3-2~exp11:8.0.4-11:8.0.4-1~bpo13+11:8.0.5-11:8.0.5-1~bpo13+11:8.0.6-11:8.0.6-1~bpo13+11:8.0.7-1~bpo13+1	1:8.0.7-1
`suricata` Ubuntu:16.04:LTS	All versions, plus listed versions 2.0.8-1build12.0.9-12.0.10-12.0.10-22.0.11-13.0-1	None known
`suricata` Ubuntu:18.04:LTS	All versions, plus listed versions 3.2-2ubuntu3	None known
`suricata` Ubuntu:22.04:LTS	All versions, plus listed versions 1:6.0.4-21:6.0.4-3	None known
`suricata` Ubuntu:24.04:LTS	All versions, plus listed versions 1:7.0.0-21:7.0.2-11:7.0.2-1build11:7.0.3-1build11:7.0.3-1build3	None known
`suricata` Ubuntu:26.10	All versions, plus listed versions 1:8.0.3-11:8.0.5-11:8.0.6-1	None known
`suricata` Ubuntu:26.04:LTS	All versions, plus listed versions 1:7.0.10-11:8.0.1-3build11:8.0.2-11:8.0.2-1build11:8.0.3-1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-94083 is a critical vulnerability (CVSS 9.4) in Oisf Suricata, published September 20, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.54%, the 45th percentile. Fixed in suricata 1:8.0.7-1.