CVE-2026-31935: Suricata http2: unbounded resource consumption

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-02 · updated 2026-10-26
Weakness: CWE-400

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.

Affected products

OISF suricata: before 7.0.15; from 8.0.0 before 8.0.4 — fixed in 7.0.15, 8.0.4

How to fix

Upgrade to a fixed version: OISF suricata 7.0.15, 8.0.4. Check the vendor advisory for mitigations.

References

https://github.com/OISF/suricata/security/advisories/GHSA-vxrp-5pg7-7v4x
https://redmine.openinfosecfoundation.org/issues/8289

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