Buffer overflow in Oisf Suricata

CVE-2026-63451

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.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-63451?
CVE-2026-63451 is a low-severity vulnerability in Oisf Suricata, classified under Heap-based Buffer Overflow. CVSS score: 3.3/10. Published 2026-09-18.
How severe is CVE-2026-63451?
Low severity. CVSS v3 base score is 3.3 out of 10.