What’s Vulnerable › Vulnerabilities

CVE-2026-27699: Basic FTP has Path Traversal Vulnerability in its downloadToDir() method

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-25 · updated 2026-06-17
• Weakness: CWE-22

Description

The `basic-ftp` FTP client library for Node.js contains a path traversal vulnerability (CWE-22) in versions prior to 5.2.0 in the `downloadToDir()` method. A malicious FTP server can send directory listings with filenames containing path traversal sequences (`../`) that cause files to be written outside the intended download directory. Version 5.2.0 patches the issue.

Affected products

• patrickjuchli basic-ftp: before 5.2.0 — fixed in 5.2.0

How to fix

Upgrade to a fixed version: patrickjuchli basic-ftp 5.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/patrickjuchli/basic-ftp/commit/2a2a0e6514357b9eda07c2f8afbd3f04727a7cd9
• https://github.com/patrickjuchli/basic-ftp/releases/tag/v5.2.0
• https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-5rq4-664w-9x2c

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