{"id":"CVE-2026-63447","summary":"Suricata ftp: crafted FTP traffic can cause quadratic CPU consumption","details":"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.","aliases":["GHSA-w394-3g33-3jg9"],"modified":"2026-09-19T11:45:30.917182256Z","published":"2026-09-18T20:21:06.510Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-407"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63447.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63447.json"},{"type":"FIX","url":"https://github.com/OISF/suricata/commit/15bf91c5ccbbbf640cd042e1c96974b262549385"},{"type":"FIX","url":"https://github.com/OISF/suricata/commit/82c41905589305e8389ceb793907ccb74798aee5"},{"type":"WEB","url":"https://github.com/OISF/suricata/releases/tag/suricata-8.0.6"},{"type":"ADVISORY","url":"https://github.com/OISF/suricata/security/advisories/GHSA-w394-3g33-3jg9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63447"},{"type":"WEB","url":"https://redmine.openinfosecfoundation.org/issues/8592"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/oisf/suricata","events":[{"introduced":"5611b60c6172fe4204cd69a9c9d466b6632dd0c7"},{"fixed":"4c28cc1b4ac64f48efdca6ce3e09748227a04a7e"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"8.0.5"},{"fixed":"8.0.6"}]}}],"versions":["suricata-8.0.5"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63447.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}