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AI agent vulnerability · Other MCP servers and tools

CVE-2026-5327: fast-filesystem-mcp is vulnerable to command injection through handleGetDiskUsage function

lowCVSS 4.0 2.1 · 3.1 6.3GHSA-5226-3rvg-hp4x

A security flaw has been discovered in efforthye fast-filesystem-mcp up to 3.5.1. The affected element is the function handleGetDiskUsage of the file src/index.ts. Performing a manipulation results in command injection. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks.

Published Apr 2, 2026 · Updated Apr 4, 2026

Affected packages

fast-filesystem-mcp

Ecosystem
npm
Affected
<= 3.5.0
Fixed in
No patched version yet
Check
npm ls fast-filesystem-mcp

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

A security flaw has been discovered in efforthye fast-filesystem-mcp up to 3.5.1. The affected element is the function handleGetDiskUsage of the file src/index.ts. Performing a manipulation results in command injection. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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