{"id":"CVE-2026-116844","aliases":[],"title":"Fclairamb ftpserverlib through 0.32.4 Cleartext FTPES Data Transfer via PROT P","description":"Fclairamb ftpserverlib through 0.32.4 contains a cleartext transmission vulnerability because TransferOpen checks only the transferTLS flag set by PROT, not whether the prepared data connection uses TLS. When a client sends PROT P after PASV or PORT, file contents and directory listings cross the network unencrypted, even with mandatory encryption, letting on-path attackers read or modify them.","severity":"medium","score":6.3,"published":"2026-10-27T00:34:02.373Z","modified":"2026-10-27T14:13:59.638Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://github.com/fclairamb/ftpserverlib/pull/685","https://github.com/fclairamb/ftpserverlib/blob/v0.32.4/handle_misc.go#L29-L31","https://github.com/fclairamb/ftpserverlib/blob/v0.32.4/client_handler.go#L720","https://www.vulncheck.com/advisories/fclairamb-ftpserverlib-through-0.32.4-cleartext-ftpes-data-transfer-via-prot-p"],"sources":[{"name":"CVE","id":"CVE-2026-116844","modified":"2026-10-27T14:13:59.638Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-116844"}],"assessments":[{"source":"CNA","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.3},{"source":"CNA","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":4.8}]}