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CVE-2026-39983— FTP Command Injection via CRLF in basic-ftp

Quick assessment

Affected
patrickjuchli basic-ftp
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Basic FTP是Patrick Juchli个人开发者的一个Node.js的FTP客户端库。 Basic FTP 5.2.1之前版本存在安全漏洞，该漏洞源于文件路径参数中可能包含CRLF序列，可能导致FTP命令注入攻击。

CVSS 8.6 · High EPSS 2.19% · P81

Affected Version Matrix 1

VendorProduct Version RangeStatus
patrickjuchli basic-ftp < 5.2.1 affected
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I. Basic Information for CVE-2026-39983

Vulnerability Information
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Vulnerability Title
FTP Command Injection via CRLF in basic-ftp
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Basic FTP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Basic FTP是Patrick Juchli个人开发者的一个Node.js的FTP客户端库。 Basic FTP 5.2.1之前版本存在安全漏洞，该漏洞源于文件路径参数中可能包含CRLF序列，可能导致FTP命令注入攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
patrickjuchli basic-ftp < 5.2.1 -

II. Public POCs for CVE-2026-39983

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7816 chars
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III. Intelligence Information for CVE-2026-39983

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Vendor Advisories for CVE-2026-39983 (1)

IV. Related Vulnerabilities

Same product: basic-ftp
Same vendor: patrickjuchli
Same weakness: CWE-93

V. Comments for CVE-2026-39983

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