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HIGH

CVE-2026-39983

CVSS v3

8.6

HIGH

EPSS Score

1.2 %

exploit probability

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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-con

Technical details

Published
2026-04-09

Frequently asked questions

What is CVE-2026-39983?

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-con

Is CVE-2026-39983 actively exploited?

Active exploitation of CVE-2026-39983 has not been confirmed. The EPSS score is 1.2%, indicating the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-39983?

CVE-2026-39983 has a CVSS v3 base score of 8.6 (HIGH severity).

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