Heap-based buffer overflow in Suricata - CVE-2026-63451
Published: July 22, 2026
Vulnerability identifier: #VU139043
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63451
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to heap-based buffer overflow in the rule loader when parsing crafted Suricata rules that combine a frame match without content and transformed without content matching. A local user can load a specially crafted rule to cause a denial of service.
The issue is triggered during rule parsing and loading, including test mode, rather than by network traffic alone.
Affected software
Suricata
How to mitigate CVE-2026-63451
Install security update from vendor's website.
Suricata - update to 8.0.6