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Fencer Vulns
critical 9.1

CVE-2026-27699 json

Basic FTP has Path Traversal Vulnerability in its downloadToDir() method

published 2026-02-25 8 mo ago modified 2026-09-10 1 mo ago also GHSA-5rq4-664w-9x2c , EUVD-2026-8643

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm basic-ftp 5.2.0
  • patrickjuchli basic-ftp 5.2.0
  • node-proxy-agents Debian 13 0~2024040606-6+deb13u1
  • node-proxy-agents Debian 14 0~2025070717+~cs15.2.7-1

debian advisories DEBIAN-CVE-2026-27699

  • agama-integration-tests openSUSE Tumbleweed 1785848065.5562c7c-4.1

opensuse advisories openSUSE-SU-2026:11452-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-27699 updated cvss 7.5

basic-ftp: basic-ftp: File overwrite due to path traversal

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
8 mo ago

Exploit prediction

0.94% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-5rq4-664w-9x2c referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected packages

ecosystem package affected fixed in
npm basic-ftp
<5.2.0
5.2.0

Affected products

  • patrickjuchli basic-ftp

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.