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.

• https://github.com/OISF/suricata/commit/15bf91c5ccbbbf640cd042e1c96974b262549385Patch
• https://github.com/OISF/suricata/commit/82c41905589305e8389ceb793907ccb74798aee5Patch
• https://github.com/OISF/suricata/releases/tag/suricata-8.0.6Release Notes
• https://github.com/OISF/suricata/security/advisories/GHSA-w394-3g33-3jg9Mitigation
• https://redmine.openinfosecfoundation.org/issues/8592Permissions Required