CVE-2026-31935 Suricata http2: unbounded resource consumption

High 7.5 Published 2 Apr 2026 Updated 2 Apr 2026

Attackers can cause Suricata to crash via memory exhaustion by flooding crafted HTTP2 continuation frames, requiring an upgrade to patched versions.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-31935?

CVE-2026-31935 is a high-severity denial of service vulnerability in Oisf Suricata, published on 2 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Suricata is a network IDS, IPS and NSM engine. Prior to versions 7.0.15 and 8.0.4, flooding of craft HTTP2 continuation frames can lead to memory exhaustion, usually resulting in the Suricata process being shut down by the operating system. This issue has been patched in versions 7.0.15 and 8.0.4.

Weakness: CWE-770, CWE-400

Which versions are affected by CVE-2026-31935?

It affects 1 product.

Products include Oisf Suricata.

How do I fix CVE-2026-31935?

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-2026-31935 being exploited?

There is no known exploitation of CVE-2026-31935 in the wild and no public exploit code.

All Oisf Suricata vulnerabilities

Sources

Also known as DEBIAN-CVE-2026-31935, GHSA-vxrp-5pg7-7v4x, UBUNTU-CVE-2026-31935.