Use-after-free in Suricata - #VU152930
Published: September 30, 2026
Vulnerability identifier: #VU152930
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to execute arbitrary code or cause a denial of service.
The vulnerability exists due to a use-after-free in lua/hashlib hash objects when matching traffic executes a malicious Lua rule script. A local privileged user can invoke __gc on an MD5, SHA-1, or SHA-256 object and then reuse it to execute arbitrary code or cause a denial of service.
Network traffic alone cannot trigger the issue without a malicious rule script.
Affected software
Suricata
Remediation
Install security update from vendor's website.
Suricata - update to 8.0.7