Memory leak in Suricata - CVE-2026-63446
Published: July 22, 2026
Vulnerability identifier: #VU139041
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-63446
CWE-ID: CWE-401
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Open Information Security Foundation
Affected software:
Suricata
Suricata
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to missing release of memory after effective lifetime in the application-layer transaction handling logic when processing flows passed by a pass rule or pass-the-flow exception policy. A remote attacker can send network traffic that creates affected transactions to cause a denial of service.
The issue occurs because completed transactions on passed flows may not be marked as inspected, allowing the per-flow transaction list to grow without bound for the lifetime of the flow.
How to mitigate CVE-2026-63446
Install security update from vendor's website.