Inefficient Algorithmic Complexity in Suricata - CVE-2026-63447
Published: July 22, 2026
Vulnerability identifier: #VU139040
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-2026-63447
CWE-ID: CWE-407
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 inefficient algorithmic complexity in the FTP parser when processing crafted FTP command data after the configured transaction threshold is reached. A remote attacker can send specially crafted FTP traffic to cause a denial of service.
This may degrade packet processing and cause loss of monitoring visibility.
How to mitigate CVE-2026-63447
Install security update from vendor's website.