Secuno
ENNL
Book demo

CVE-2026-39983

Patrickjuchli Basic-ftp command injection

8.6 HIGHPublic exploitEPSS 2.80%
  1. Published9 Apr 2026

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityLow
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

Affected products

Patrickjuchli Basic-ftp< 5.2.1

Remediation

Fixed in
Patrickjuchli Basic-ftp≥ 5.2.1

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-829739.4
Improper neutralization of CRLF sequences in IMAP command construction in…
CVE-2026-1007179.9
froxlor is a server administration panel. In versions 2.3.10 and earlier,…
CVE-2026-551598.8
luci-app-adblock-fast a WebUI for fast, lightweight DNS-based ad-blocker for OpenWrt…
CVE-2026-405308.0
An improper neutralization of CRLF sequences ('CRLF injection') vulnerability in User…
CVE-2026-909379.9
froxlor versions before 2.2.5 fail to validate newline characters in subdomain redirect…
CVE-2026-480198.9
Laravel is a web application framework. Prior to versions 12.60.0 and 13.10.0, a CRLF…

Frequently asked

Is CVE-2026-39983 being actively exploited?

CVE-2026-39983 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 2.80%.

How severe is CVE-2026-39983?

CVE-2026-39983 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 2.80% probability of exploitation.

Which products are affected by CVE-2026-39983?

Affected products include Patrickjuchli Basic-ftp.

How do I fix CVE-2026-39983?

Upgrade affected software to a fixed version, for example Patrickjuchli Basic-ftp 5.2.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39983 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.