CVE-2026-5327 Details
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.
A command injection vulnerability exists in Efforthye Fast-Filesystem-MCP in versions through 3.5.1. The issue arises in the 'handleGetDiskUsage' function within 'src/index.ts', where user-controlled input is improperly sanitized before being executed as a shell command. This vulnerability can be exploited remotely, allowing attackers to execute arbitrary commands on the server with the same privileges as the MCP process.
It is recommended to avoid using 'execAsync' for command execution. Instead, use 'execFileSync', which allows for safer command execution by treating arguments as separate elements, reducing the risk of injection. Additionally, implement strict input validation for all parameters exposed to MCP clients, particularly those related to file paths, and use proper escaping to prevent shell command injection.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Apr 2, 2026CISA-ADP
Assessed Apr 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/efforthye/fast-filesystem-mcp/ | [email protected] | ProductVendor |
| https://github.com/efforthye/fast-filesystem-mcp/issues/15 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/user-attachments/files/25822878/fast-filesystem-mcp_bug.pdf | [email protected] | |
| https://vuldb.com/submit/780776 | [email protected] | Technical Description |
| https://vuldb.com/vuln/354658 | [email protected] | AdvisoryExploitPartial Content |
| https://vuldb.com/vuln/354658/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-74 | Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') | [email protected] |
| CWE-77 | Improper Neutralization of Special Elements used in a Command ('Command Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| efforthye fast-filesystem-mcp | All versions |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Apr 2, 2026 | New CVE Received | [email protected] |