Vulnerability in Oisf Suricata

CVE-2026-63447

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.5 until 8.0.6, the FTP parser in src/app-layer-ftp.c can continue allocating transactions after app-layer.protocols.ftp.max-tx is reached while processing one large chunk of FTP command data. The oversized transaction list is repeatedly processed with quadratic complexity after the too_many_transactions event, allowing crafted FTP traffic to degrade packet processing, reduce monitoring visibility, or cause denial of service. This issue is fixed in version 8.0.6.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-63447?
CVE-2026-63447 is a high-severity vulnerability in Oisf Suricata, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-09-18.
How severe is CVE-2026-63447?
High severity. CVSS v3 base score is 7.5 out of 10.