CVE-2026-81941: IBM Langflow OSS command execution through MCP Tools stdio transport

Summary

IBM Langflow OSS versions 1.0.0 through 1.11.5 contain CVE-2026-81941. An authenticated non-administrative user can build a flow with an MCP Tools component set to a local stdio subprocess transport and run arbitrary operating system commands at the privilege level of the application process. This bypasses the LANGFLOW_CUSTOM_COMPONENT_ADMIN_ONLY and LANGFLOW_BLOCK_CODE_INTERPRETER_COMPONENTS server-side controls. Successful exploitation could expose credentials from the process environment, modify the file system, and reach other services on the server.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Topics

• Model Context Protocol

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