{"schemaVersion":3,"id":"CVE-2026-63450","aliases":["UBUNTU-CVE-2026-63450","DEBIAN-CVE-2026-63450"],"status":"published","duplicateOf":null,"title":"Suricata ftp: RETR/STOR before PORT/PASV can disable further IDS app-layer detection","description":"Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 8.0.6, the FTP parser in src/app-layer-ftp.c treats a RETR or STOR command sent before PORT or PASV negotiation as a fatal application-layer error instead of a recoverable protocol event. The fatal state disables FTP application-layer parsing for the remainder of the TCP flow, so later commands can evade parser-dependent rules and logging; IPS mode instead drops the flow. 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