CVE-2026-27699: basic-ftp: basic-ftp: File overwrite due to path traversal

Severity: Critical

CVSS Score: 9.1

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.