CVE-2026-45764 Suricata http2: protocol-change type confusion can lead to denial of service
Crafted HTTP/2 traffic causes type confusion in Suricata, leading to a crash and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45764?
CVE-2026-45764 is a critical denial of service vulnerability in Oisf Suricata, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-843
Which versions are affected by CVE-2026-45764?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-45764?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-45764 being exploited?
There is no known exploitation of CVE-2026-45764 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-45764, GHSA-5rvq-72r5-rqhr, UBUNTU-CVE-2026-45764.