---
title: "CVE-2026-27699: Basic FTP has Path Traversal Vulnerability in its downloadToDir() method"
url: https://erroneo.us/security/cve/CVE-2026-27699/
description: "CVE-2026-27699 (basic-ftp (npm)): The basic-ftp FTP client library for Node.js contains a path traversal vulnerability (CWE-22) in versions prior to 5.2.0…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-02-25
date_modified: 2026-02-27
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-27699"
kev: false
cvss: 9.1
epss: 0.01029
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-27699: Basic FTP has Path Traversal Vulnerability in its downloadToDir() method

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 1.0% , percentile 63: FIRST’s model estimates a 1.0% chance of exploitation activity in the next 30 days, higher than 63% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes basic-ftp (npm) < 5.2.0, fixed in 5.2.0 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- npm `basic-ftp` < 5.2.0 → fixed: 5.2.0

## Affected products (CVE record)

- patrickjuchli basic-ftp: < 5.2.0

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.03% probability of exploitation activity in the next 30 days; percentile 63.

## Sources

- [GitHub Advisory GHSA-5rq4-664w-9x2c](https://github.com/advisories/GHSA-5rq4-664w-9x2c)
- [CVE.org record CVE-2026-27699](https://www.cve.org/CVERecord?id=CVE-2026-27699)
- [NVD entry CVE-2026-27699](https://nvd.nist.gov/vuln/detail/CVE-2026-27699)
- [github.com](https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-5rq4-664w-9x2c)
- [github.com](https://github.com/patrickjuchli/basic-ftp/commit/2a2a0e6514357b9eda07c2f8afbd3f04727a7cd9)
- [github.com](https://github.com/patrickjuchli/basic-ftp/releases/tag/v5.2.0)

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Source page: https://erroneo.us/security/cve/CVE-2026-27699/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt