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CVE-2026-27699

Patrickjuchli Basic-ftp path traversal

9.1 CRITICALPublic exploitEPSS 1.01%
  1. Published25 Feb 2026

Description

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.

CVSS 3.1 breakdown

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

Affected products

Patrickjuchli Basic-ftp< 5.2.0

Remediation

Fixed in
Patrickjuchli Basic-ftp≥ 5.2.0

References

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Frequently asked

Is CVE-2026-27699 being actively exploited?

CVE-2026-27699 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.01%.

How severe is CVE-2026-27699?

CVE-2026-27699 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 1.01% probability of exploitation.

Which products are affected by CVE-2026-27699?

Affected products include Patrickjuchli Basic-ftp.

How do I fix CVE-2026-27699?

Upgrade affected software to a fixed version, for example Patrickjuchli Basic-ftp 5.2.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27699 against the real software inventory on every managed device, as each hourly inventory arrives. 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.

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