CVE-2026-63451 Suricata detect: frame rules without content and with transform can cause heap buffer overflow during rule load
Loading a crafted detection rule triggers a heap buffer overflow, crashing the Suricata IDS/IPS engine.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63451?
CVE-2026-63451 is a low-severity memory corruption vulnerability in Oisf Suricata, published on 18 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-122
Which versions are affected by CVE-2026-63451?
It affects 1 product.
Products include Oisf Suricata.
How do I fix CVE-2026-63451?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-63451 being exploited?
There is no known exploitation of CVE-2026-63451 in the wild and no public exploit code.
Other vulnerabilities in Oisf Suricata
Sources
Also known as DEBIAN-CVE-2026-63451, GHSA-6qwq-j83r-qp34, UBUNTU-CVE-2026-63451.