CVE-2026-94046
Received Received - Intake

Path Traversal in ACE-MCP Tool via MCP Component

Publication date: 2026-09-20

Last updated on: 2026-09-20

Assigner: VulDB

Description
A weakness has been identified in 0215AndrewFeng ACE-MCP up to 4.10.8. The affected element is the function get_file_snippet of the file getFileSnippet.ts of the component MCP Tool. Executing a manipulation of the argument projectRootPath/filePath can lead to path traversal. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. isPathInsideProjectRoot only blocks filePath escaping the attacker-chosen projectRootPath; the root itself is untrusted client input - set projectRootPath=/etc, filePath=hosts and the guard passes. The project was informed of the problem early through an issue report but has not responded yet.

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Meta Information

Published
2026-09-20
Last Modified
2026-09-20
Generated
2026-09-21
AI Q&A
2026-09-20
EPSS Evaluated
N/A
NVD
CVE-2026-94046
EUVD
EUVD-2026-83780

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
0215andrewfeng ace-mcp 4.10.8

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

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Executive Summary

CVE-2026-94046 is a path traversal vulnerability in the ACE-MCP tool up to version 4.10.8. The get_file_snippet function improperly handles attacker-controlled projectRootPath and filePath arguments, allowing arbitrary file reads outside intended project boundaries. An attacker can set projectRootPath to a sensitive directory like /etc and read files such as /etc/hosts through the MCP interface.

Detection Guidance

Check if the ACE-MCP tool version 4.10.8 or earlier is running on your system. Look for the get_file_snippet MCP tool in use. Test by attempting to read sensitive files like /etc/hosts through the MCP interface. Monitor for unexpected file access patterns or errors in logs.

Impact Analysis

This vulnerability allows remote attackers with access to the MCP interface to read arbitrary files on the server system. Sensitive information like configuration files, credentials, or system files could be exposed. The impact depends on the server's filesystem permissions and the files it can access.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. Organizations using affected versions may face compliance violations, legal penalties, and reputational damage if exploited.

Mitigation Strategies

Disable or restrict access to the get_file_snippet MCP tool. Implement server-side allowlists for projectRootPath. Use realpath for path canonicalization and reject absolute filePath values. Run the server with least-privilege filesystem permissions. Block external access to the MCP interface if not required.

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