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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Patrickjuchli | Basic-Ftp | < 5.2.1 |
Related Weaknesses (CWE)
References
- https://github.com/patrickjuchli/basic-ftp/commit/2ecc8e2c500c5234115f06fd1dbde1Patch
- https://github.com/patrickjuchli/basic-ftp/releases/tag/v5.2.1ProductRelease Notes
- https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-chqc-8p9q-pqExploitMitigationVendor Advisory
- https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-chqc-8p9q-pqExploitMitigationVendor Advisory
FAQ
What is CVE-2026-39983?
CVE-2026-39983 is a vulnerability with a CVSS score of 8.6 (HIGH). 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(), ...
How severe is CVE-2026-39983?
CVE-2026-39983 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-39983?
Check the references section above for vendor advisories and patch information. Affected products include: Patrickjuchli Basic-Ftp.