CVE-2026-5029
HighSummary
A remote code execution vulnerability exists in Code Runner MCP Server when run with the --transport http option, exposing the /mcp JSON-RPC endpoint without authentication on port 3088. An unauthenticated remote attacker can invoke the run-code MCP tool to supply arbitrary source code and execute it via child_process.exec().
Risk Assessment
An attacker can execute arbitrary code with the privileges of the user running the server, posing a serious security threat to the organization.
Recommendation
It is recommended to immediately block access to the /mcp endpoint and implement appropriate security measures to prevent unauthorized access.
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Original NVD description (English source)
A remote code execution vulnerability exists in Code Runner MCP Server when run with the --transport http option, which exposes the /mcp JSON-RPC endpoint without authentication on port 3088. An unauthenticated remote attacker can invoke the run-code MCP tool to supply arbitrary source code and execute it via child_process.exec() using the specified language interpreter. This allows execution of arbitrary code with the privileges of the user running the server. This vulnerability has not been fixed and might affect the project in all versions.