Vulnerability · Published Sep 10, 2026 · Assigned by GitHub_M

CVE-2026-45764Suricata http2: protocol-change type confusion can lead to denial of service

Critical 9.1

In plain English

A critical-severity type confusion in suricata from OISF. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)0.6%top 49.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, a protocol change while processing HTTP/2 traffic could lead to type confusion in Suricata. Crafted traffic may cause Suricata to crash, resulting in denial of service. Versions 7.0.16 and 8.0.5 contain a fix. As a workaround, disable HTTP/2 parsing if it is not required.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	suricata	no fix listed	DEBIAN-CVE-2026-45764
Debian:14	suricata	1:8.0.5-1	DEBIAN-CVE-2026-45764
Ubuntu:22.04:LTS	suricata	no fix listed	UBUNTU-CVE-2026-45764
Ubuntu:24.04:LTS	suricata	no fix listed	UBUNTU-CVE-2026-45764
Ubuntu:26.04:LTS	suricata	no fix listed	UBUNTU-CVE-2026-45764

Affected products (as reported)

Vendor	Product	Versions
OISF	suricata	>= 8.0.0, < 8.0.5< 7.0.16

Weakness: CWE-843 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

References

https://github.com/OISF/suricata/security/advisories/GHSA-5rvq-72r5-rqhr x_refsource_CONFIRM
https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315 x_refsource_MISC
https://redmine.openinfosecfoundation.org/issues/8492 x_refsource_MISC