TI-2026-04659 Aliases CVE-2026-5327 GHSA-5226-3rvg-hp4x

efforthye fast-filesystem-mcp index.ts handleGetDiskUsage command injection

MEDIUM 57CWE-74Published 2026-04-02 · Updated 2026-04-02

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: Low · Low · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-77.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01243 69th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
efforthye	fast-filesystem-mcp	3.5.0; 3.5.1	—	No fix listed	CNA
—	fast-filesystem-mcp (npm)	up to 3.5.0	—	No fix listed	GHSA-5226-3rvg-hp4x

fast-filesystem-mcp Vendorefforthye Affected 3.5.0; 3.5.1 Fixed in — No fix listed CNA
fast-filesystem-mcp (npm) Vendor— Affected up to 3.5.0 Fixed in — No fix listed GHSA-5226-3rvg-hp4x

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:efforthye:fast-filesystem-mcp::::::::	—	—	efforthye

cpe:2.3:a:efforthye:fast-filesystem-mcp:*:*:*:*:*:*:*:* Versions — — ·efforthye

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-5327
2026-10-03 Alias added: GHSA-5226-3rvg-hp4x

References

Exploit 1

https://github.com/user-attachments/files/25822878/fast-filesystem-mcp_bug.pdf

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-5327

Other 3

TI-2025-41197 fast-filesystem-mcp version 3.4.0 contains a critical path traversal vulnerability in its… CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences