CVE-2026-7213: MLOps_MCP Path Traversal Vulnerability

CVE-2026-7213 Overview

A path traversal vulnerability has been identified in ef10007 MLOps_MCP version 1.0.0. The vulnerability exists in the save_file Tool within the fastmcp_server.py file, where improper handling of the filename and destination arguments allows attackers to traverse directory paths. This flaw can be exploited remotely to access, modify, or overwrite files outside of the intended directory structure.

Critical Impact
Remote attackers can exploit this path traversal vulnerability to read, write, or overwrite arbitrary files on the server, potentially leading to sensitive data exposure, configuration tampering, or system compromise.

Affected Products

ef10007 MLOps_MCP 1.0.0
Systems running the fastmcp_server.py component with the save_file Tool enabled

Discovery Timeline

2026-04-28 - CVE-2026-7213 published to NVD
2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-7213

Vulnerability Analysis

This path traversal vulnerability (CWE-22) affects the save_file Tool in the MLOps_MCP project. The vulnerability arises from insufficient validation of user-supplied input in the filename and destination parameters. When these parameters are processed by the fastmcp_server.py component, an attacker can inject directory traversal sequences (such as ../) to escape the intended file storage directory.

The exploit has been publicly disclosed, and the project maintainers were notified through a GitHub Issue but have not yet responded. This lack of response increases the risk window for organizations using this software.

Root Cause

The root cause of this vulnerability is insufficient input sanitization in the file handling logic. The save_file Tool does not properly validate or sanitize the filename and destination arguments before using them in file system operations. This allows attackers to use path traversal sequences to break out of the intended directory and access arbitrary locations on the file system.

Proper mitigation would require implementing strict input validation that rejects or sanitizes directory traversal sequences and validates that the resolved path remains within the expected directory boundaries.

Attack Vector

The vulnerability is exploitable remotely over the network. An attacker can send crafted requests to the save_file Tool endpoint with malicious filename or destination values containing path traversal sequences. This does not require authentication or user interaction, making it particularly dangerous for internet-exposed instances.

The attack flow typically involves:

Identifying an exposed MLOps_MCP instance running the vulnerable fastmcp_server.py
Crafting a request to the save_file Tool with traversal sequences in the filename or destination parameters
Leveraging the traversal to read sensitive configuration files, overwrite system files, or plant malicious content

For technical details on the vulnerability mechanism, refer to the VulDB vulnerability entry and the GitHub Issue Discussion.

Detection Methods for CVE-2026-7213

Indicators of Compromise

Unusual file access patterns in server logs, particularly requests containing ../ or encoded traversal sequences (%2e%2e%2f)
Unexpected files appearing outside of designated upload directories
Modified configuration files or system files with recent timestamps
Web server or application logs showing requests to the save_file endpoint with suspicious path parameters

Detection Strategies

Implement web application firewall (WAF) rules to detect and block path traversal patterns in request parameters
Monitor file system activity for write operations outside of expected directories associated with the MLOps_MCP application
Deploy intrusion detection systems (IDS) with signatures for common path traversal attack patterns
Review application logs for requests containing directory traversal sequences targeting the save_file Tool

Monitoring Recommendations

Enable detailed logging for the fastmcp_server.py component to capture all file operation requests
Set up alerts for file creation or modification events outside the designated upload directories
Implement file integrity monitoring (FIM) on critical system files and configuration directories
Monitor network traffic for unusual patterns targeting the MLOps_MCP service endpoints

How to Mitigate CVE-2026-7213

Immediate Actions Required

Restrict network access to MLOps_MCP instances to trusted sources only
Implement a web application firewall with path traversal detection rules in front of the application
Review and audit any files that may have been created or modified by the vulnerable component
Consider disabling the save_file Tool functionality until a patch is available

Patch Information

As of the last update on 2026-04-29, no official patch has been released by the project maintainers. The GitHub Issue reporting the vulnerability remains open without a response. Organizations should monitor the MLOps_MCP GitHub repository for updates and apply patches as soon as they become available.

Workarounds

Deploy a reverse proxy or WAF that filters requests containing path traversal sequences before they reach the application
Implement network segmentation to limit the potential impact of a successful exploitation
Apply filesystem permissions that restrict the application's write access to only necessary directories
Consider running the application in a containerized environment with restricted filesystem access

bash

# Example: Restrict application directory access (Linux)
# Set restrictive permissions on the application directory
chmod 750 /opt/mlops_mcp
chown -R mlops_user:mlops_group /opt/mlops_mcp

# Configure AppArmor or SELinux to confine file access
# Example AppArmor profile snippet
# /opt/mlops_mcp/fastmcp_server.py {
#   /opt/mlops_mcp/uploads/ rw,
#   deny /etc/** w,
#   deny /var/** w,
# }