Vulnerability Description
MCP Context Forge is an AI gateway, registry, and proxy for MCP, A2A, REST, and gRPC APIs. Prior to 1.0.2, the python_sandbox_server in mcp-servers/python/python_sandbox_server/src/python_sandbox_server/server_fastmcp.py exposes raw getattr through safe_builtins, omits a required _getattr_ guard, and relies on validate_code checks for literal dangerous dunder strings. An attacker can construct dunder names at runtime, traverse the Python class hierarchy, reach subprocess.Popen, and execute OS commands with the server process privileges through the execute_code MCP tool. The HTTP/SSE transport can expose this tool without authentication, while stdio-only deployments have reduced network reachability. The issue affects the python_sandbox_server subproject and does not directly affect the core Context Forge gateway or proxy components. This issue is fixed in version 1.0.2.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/IBM/mcp-context-forge/commit/63a2900e6301b9c8a483a38d3737a1be
- https://github.com/IBM/mcp-context-forge/releases/tag/v1.0.2
- https://github.com/IBM/mcp-context-forge/security/advisories/GHSA-xm98-3vcf-fph7
FAQ
What is CVE-2026-53710?
CVE-2026-53710 is a vulnerability with a CVSS score of 10.0 (CRITICAL). MCP Context Forge is an AI gateway, registry, and proxy for MCP, A2A, REST, and gRPC APIs. Prior to 1.0.2, the python_sandbox_server in mcp-servers/python/python_sandbox_server/src/python_sandbox_serv...
How severe is CVE-2026-53710?
CVE-2026-53710 has been rated CRITICAL with a CVSS base score of 10.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-53710?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.