CRLF Injection Affecting basic-ftp package, versions <5.2.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-BASICFTP-15953339
- published9 Apr 2026
- disclosed8 Apr 2026
- creditzebbern
Introduced: 8 Apr 2026
NewCVE-2026-39983 (opens in a new tab)How to fix?
Upgrade basic-ftp to version 5.2.1 or higher.
Overview
basic-ftp is a FTP client for Node.js, supports FTPS over TLS, IPv6, Async/Await, and Typescript.
Affected versions of this package are vulnerable to CRLF Injection via unsanitized path parameters in the protectWhitespace function. An attacker can execute arbitrary FTP commands by injecting CRLF sequences into file path inputs, which are then interpreted as separate commands by the FTP server. This can lead to unauthorized file deletion, directory manipulation, file exfiltration, command execution on supporting servers, session hijacking, or service disruption.