fast-filesystem-mcp is vulnerable to command injection through handleGetDiskUsage function
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | fast-filesystem-mcp | <= 3.5.0 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-5327
- https://github.com/efforthye/fast-filesystem-mcp/issues/15
- https://github.com/efforthye/fast-filesystem-mcp
- https://github.com/user-attachments/files/25822878/fast-filesystem-mcp_bug.pdf
- https://vuldb.com/submit/780776
- https://vuldb.com/vuln/354658
- https://vuldb.com/vuln/354658/cti
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L- Weakness (CWE)
CWE-74- Platform
- npm
- Package
fast-filesystem-mcp- Disclosed
- 02.04.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-5226-3rvg-hp4x - CC BY 4.0
Vulnerability history: fast-filesystem-mcp
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 01.2026 04.2026
- Without a fix
- 2
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Low 1
Disclosures per year
- 2026: 2
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fast-filesystem-mcp is vulnerable to command injection through handleGetDiskUsage function this entry
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