Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') Affecting fast-filesystem-mcp package, versions *
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JS-FASTFILESYSTEMMCP-15995502
- published12 Apr 2026
- disclosed2 Apr 2026
- creditUnknown
Introduced: 2 Apr 2026
NewCVE-2026-5327 (opens in a new tab)How to fix?
There is no fixed version for fast-filesystem-mcp.
Overview
fast-filesystem-mcp is a Fast Filesystem MCP Server - Advanced file operations with Auto-Chunking, Sequential Reading, complex file operations (copy, move, delete, batch, compress), optimized for Claude Desktop
Affected versions of this package are vulnerable to Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') via the handleGetDiskUsage function. An attacker can execute arbitrary system commands by supplying crafted input remotely.