CVE-2026-39983
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().
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.19%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 8.6 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
- EPSS
- 2.19% probability · 81th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-93
- Affected
- patrickjuchli/basic-ftp
- Source
- security-advisories@github.com
References
- https://github.com/patrickjuchli/basic-ftp/commit/2ecc8e2c500c5234115f06fd1dbde1aa03d70f4bPatch
- https://github.com/patrickjuchli/basic-ftp/releases/tag/v5.2.1Product, Release Notes
- https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-chqc-8p9q-pq6qExploit, Mitigation, Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:13826
- https://access.redhat.com/errata/RHSA-2026:9742
- https://access.redhat.com/security/cve/CVE-2026-39983
- https://bugzilla.redhat.com/show_bug.cgi?id=2456971
- https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-chqc-8p9q-pq6qExploit, Mitigation, Vendor Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39983.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.