CVE-2026-39983: basic-ftp is an FTP client for Node.js

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HIGH 8.6REMOTEUPGRADE

CVE-2026-39983 is a high-severity flaw (CVSS 8.6) affecting basic-ftp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-93
Published	2026-04-09
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: patrickjuchli

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 18:17 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

patrickjuchli basic-ftp UPGRADE

Affected: < 5.2.1

Fixed in: 5.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls basic-ftp

2. UPGRADE to 5.2.1

npm install basic-ftp@">=5.2.1"

Exact fixes by distribution

npm · basic-ftp · FIXED · 5.2.1 · vulnerable: = 5.2.0 · source

npm install basic-ftp@">=5.2.1" npm ls basic-ftp

Fedora 46 · ruff · FIXED · 0.17.3-1.fc46 · FEDORA-2026-63898fdcbb · source

sudo dnf upgrade --advisory=FEDORA-2026-63898fdcbb

Fedora ELN · xorg-x11-server-Xwayland · FIXED · 26.0.99.903-2.eln159 · FEDORA-2026-4581dab0ed · source

sudo dnf upgrade --advisory=FEDORA-2026-4581dab0ed

Debian 13 · node-proxy-agents · NO FIX YET

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: zebbernCVE/CVE-2026-39983 (0 stars)
Write-up: github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-chqc-8p9q-pq6q

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39983?

basic-ftp: upgrade to 5.2.1. Exact commands for each OS are on this page.

Is CVE-2026-39983 being exploited?

CVE-2026-39983 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39983 affect?

CVE-2026-39983 affects basic-ftp. Severity is high (CVSS 8.6). 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(), li

How urgent is CVE-2026-39983?

Priority 61/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Node.js vulnerabilities

Related CVEs

CVE-2026-41324 HIGH 7.5 UPGRADE basic-ftp is an FTP client for Node.js

References

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