CVE-2026-5327: efforthye fast-filesystem-mcp index.ts handleGetDiskUsage command injection

Severity: medium (CVSS 6.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-02 · updated 2026-10-26
Weakness: CWE-74

Description

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 products

efforthye fast-filesystem-mcp: 3.5.0, 3.5.1

References

https://github.com/efforthye/fast-filesystem-mcp/
https://github.com/efforthye/fast-filesystem-mcp/issues/15
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

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