OISF Suricata up to 8.0.5 FTP Parser src/app-layer-ftp.c resource consumption

Summaryinfo

A vulnerability, which was classified as critical, was found in OISF Suricata up to 8.0.5. This affects an unknown function of the file src/app-layer-ftp.c of the component FTP Parser. Such manipulation leads to resource consumption. This vulnerability is uniquely identified as CVE-2026-63447. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in OISF Suricata up to 8.0.5 and classified as critical. Affected by this issue is some unknown functionality of the file src/app-layer-ftp.c of the component FTP Parser. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-63447 since 07/16/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 8.0.6 eliminates this vulnerability.

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Productinfo

Vendor

• OISF

Name

• Suricata

Version

• 8.0.0
• 8.0.1
• 8.0.2
• 8.0.3
• 8.0.4
• 8.0.5

License

• open-source

Website

• Product: https://github.com/OISF/suricata/

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