What’s Vulnerable › Vulnerabilities

CVE-2026-63451: Suricata detect: frame rules without content and with transform can cause heap buffer overflow during rule load

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-18 · updated 2026-09-28
• Weakness: CWE-122

Description

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

How to fix

Upgrade to a fixed version: OISF suricata 8.0.6. Check the vendor advisory for mitigations.

References

• https://github.com/OISF/suricata/commit/5449ae170bfce213907d9bab87143a59774ed48f
• https://github.com/OISF/suricata/commit/d62acf5d75a61b76b16815e773408852f41b1975
• https://github.com/OISF/suricata/pull/15807
• https://github.com/OISF/suricata/releases/tag/suricata-8.0.6
• https://github.com/OISF/suricata/security/advisories/GHSA-6qwq-j83r-qp34
• https://redmine.openinfosecfoundation.org/issues/8590

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