CVE-2026-63451: Oisf Suricata

Medium severity, CVSS 5.5. EPSS: 0.1% chance of exploitation in the next 30 days.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, a locally supplied detection rule that combines frame inspection without content and a transformed match without content can make src/detect-engine-prefilter.c select multiple non-prefilter frame engines while preparing signatures for non-prefilter inspection. Loading the crafted rule, including in test mode, can trigger a heap buffer overflow and crash Suricata; network traffic alone cannot reach the flaw. This issue is fixed in version 8.0.6.

Affected products

• Oisf Suricata: from 8.0.0, before 8.0.6 (fixed in 8.0.6)

Published 2026-09-18. Last modified 2026-09-28.