Node.js CVE-2026-27699
CRITICAL
GHSA-5rq4-664w-9x2c
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
-
AccessConnect to malicious FTP server
-
ExploitReceive crafted directory listing with ../ sequences
-
ExecutiondownloadToDir() writes files outside target directory
-
ImpactArbitrary file write on client filesystem
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V5 - File Handling Path canonicalization, traversal prevention
MITRE ATT&CK
2 techniques across 2 tactics: Discovery, Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Application uses basic-ftp library version prior to 5.2.0 with downloadToDir() method against untrusted FTP servers. No authentication required; attacker controls FTP server response. |
| Impact | CVSS 9.1. Supply chain risk — applications using basic-ftp to download from untrusted FTP servers are vulnerable. |
| Exploit ScenarioDerived | Malicious FTP server returns filenames with '../' traversal, basic-ftp writes downloaded files outside the intended directory, overwriting configuration or injecting code. |
Get an e-mail when this CVE is exploited, patched or re-scored. Free account.
Alert meAnalysisAIv1 – Mar 12, 2026
Path traversal in basic-ftp Node.js FTP client library before 5.2.0 allows malicious FTP servers to write files outside the intended download directory. PoC and patch available.
Earlier versions of this analysis (1)
Path traversal in basic-ftp Node.js library.
RemediationAI
Update basic-ftp to 5.2.0. Validate/sanitize filenames from FTP servers.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in npm
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
CWE-22 path traversal. When downloading files from an FTP server, malicious filenames with traversal sequences can write to arbitrary locations on the client.
Know when Node.js gets its next vulnerability
- Watch products and get an email when something new is published
- Check this CVE against your own stack and servers
- Exploit and PoC references, threat intelligence from 22 sources
No credit card · 7-day full trial
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
Executive ViewAI
Organizations using the basic-ftp Node.js library are at critical risk of unauthorized file system access through a path traversal vulnerability that enables attackers to read, modify, or delete arbitrary files on affected systems. This vulnerability has a public exploit available and affects any application using vulnerable versions of basic-ftp for file transfer operations, potentially compromising sensitive data and system integrity.
Apply vendor patch.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.
Affected Products (CPE)GitHub Advisory
Remote code execution in n8n's workflow expression evaluation system allows an authenticated user with workflow creation
A vulnerability in the NuPoint Unified Messaging (NPM) component of Mitel MiCollab through 9.8 SP1 FP2 (9.8.1.201) could
FortiOS and FortiProxy contain an authentication bypass via the Node.js websocket module allowing unauthenticated remote
Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour
Eval injection vulnerability in the internals.batch function in lib/batch.js in the bassmaster plugin before 1.5.2 for t
Flowise version 3.0.5 contains a remote code execution vulnerability in the CustomMCP node. The mcpServerConfig paramete
Node.js 8.5.0 before 8.6.0 allows remote attackers to access unintended files, because a change to ".." handling was inc
An issue was discovered in the node-serialize package 0.0.4 for Node.js. Rated critical severity (CVSS 9.8), this vulner
OpenSSL before 0.9.8za, 1.0.0 before 1.0.0m, and 1.0.1 before 1.0.1h does not properly restrict processing of ChangeCiph
Directory traversal vulnerability in the st module before 0.2.5 for Node.js allows remote attackers to read arbitrary fi
Multiple SQL injection vulnerabilities in the Manage Accounts page in the AccountManagement.asmx service in the Solarwin
A vulnerability in NuPoint Messenger (NPM) of Mitel MiCollab through 9.8.0.33 allows an unauthenticated attacker to cond
Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
View allVendor StatusVendor
SUSE
Severity: Critical| Product | Status |
|---|---|
| SUSE Linux Enterprise Server 16.0 | Fixed |
| SUSE Linux Enterprise Server 16.1 | Fixed |
| SUSE Linux Enterprise Server for SAP applications 16.0 | Fixed |
| SUSE Linux Enterprise Server for SAP applications 16.1 | Fixed |
Exploit-DB