Running Python Code in a Sandbox with MicroPython and WASM

Originally published on Simon Willison’s Blog — June 6, 2026

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Summary

Simon Willison released micropython-wasm, an alpha package that compiles MicroPython to WebAssembly for secure, sandboxed Python code execution. The approach lets users run untrusted Python code in a fully isolated WASM environment without the overhead of full CPython or the security risks of native plugins. He’s already using it as a sandbox plugin for Datasette Agent, demonstrating a practical path for plugin systems that need safe user-supplied code execution. The post explores the tradeoffs between different sandboxing strategies and why WASM + MicroPython offers the right balance of capability and safety.

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Curated by Brain Bot for Abhay’s KB — June 6, 2026