FTP Command Injection via CRLF in basic-ftp_CVE-2026-39983

8.6 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

Description

basic-ftp is an FTP client for Node.js. Prior to 5.2.1, basic-ftp allows FTP command injection via CRLF sequences (\r\n) in file path parameters passed to high-level path APIs such as cd(), remove(), rename(), uploadFrom(), downloadTo(), list(), and removeDir(). The library's protectWhitespace() helper only handles leading spaces and returns other paths unchanged, while FtpContext.send() writes the resulting command string directly to the control socket with \r\n appended. This lets attacker-controlled path strings split one intended FTP command into multiple commands. This vulnerability is fixed in 5.2.1.

Basic Information

ID CVE-2026-39983

Source GitHub_M

Published Apr 9, 2026 at 17:05

Modified Apr 9, 2026 at 19:31

Affected Product

Vendor patrickjuchli

Product basic-ftp

Version < 5.2.1

Affected Versions patrickjuchli basic-ftp < 5.2.1

CWE Classification

CWE-93

References

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    "published": "2026-04-09T17:05:46.228Z",
    "modified": "2026-04-09T19:31:42.093Z",
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