CVE-2024-32663: Suricata 's http2 parser contains an improper compressed header handling can lead to resource starvation

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-07 · updated 2026-06-17
Weakness: CWE-400

Description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.5 and 6.0.19, a small amount of HTTP/2 traffic can lead to Suricata using a large amount of memory. The issue has been addressed in Suricata 7.0.5 and 6.0.19. Workarounds include disabling the HTTP/2 parser and reducing `app-layer.protocols.http2.max-table-size` value (default is 65536).

Affected products

OISF suricata: from 6.0.0 before 6.0.19; from 7.0.0 before 7.0.5 — fixed in 6.0.19, 7.0.5

How to fix

Upgrade to a fixed version: OISF suricata 6.0.19, 7.0.5. Check the vendor advisory for mitigations.

References

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