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CVE-2026-39983

8.6 · HIGH

basic-ftp is an FTP client for Node.js.

Published Apr 9, 2026CWE-93EPSS 2.80%

Overview

CVE-2026-39983 is a high-severity vulnerability. It was published on April 9, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/patrickjuchli/basic-ftp/commit/2ecc8e2c500c5234115f06fd1dbde1aa03d70f4bGitHubgithub.com/patrickjuchli/basic-ftp/releases/tag/v5.2.1GitHubgithub.com/patrickjuchli/basic-ftp/security/advisories/GHSA-chqc-8p9q-pq6qRefaccess.redhat.com/errata/RHSA-2026:13826Refaccess.redhat.com/errata/RHSA-2026:9742Refaccess.redhat.com/security/cve/CVE-2026-39983Refbugzilla.redhat.com/show_bug.cgi?id=2456971GitHubgithub.com/patrickjuchli/basic-ftp/security/advisories/GHSA-chqc-8p9q-pq6qRefsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39983.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-39983?

CVE-2026-39983 is a high-severity vulnerability. It was published on April 9, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2026-39983?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-39983?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-39983?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-39983 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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