WebAssembly sandboxing is a way to run code inside a controlled environment where the code only gets the specific access that the host system decides to give it.

In this episode, Satish uses a simple real-life example first, then turns the idea into a practical technical mental model for engineers and curious builders.

In Simple Terms with Satish: daily tech trends explained simply, with enough technical depth for builders.

Production note: This episode uses authorized synthetic narration based on Satish's own voice. The topic, script, and final editorial approval are by Satish.

Engineer notes:

Exact technical references:

- Wasmtime says one of WebAssembly's main goals is to execute untrusted code safely inside a sandbox.

- Wasmtime says outside-world interaction happens only through explicit imports and exports.

- Wasmtime documents WASI filesystem access as capability-based.

- WASI.dev describes WASI as a secure standard interface for Wasm software across many environments.

- The Component Model docs describe components as interoperable building blocks and note that WASI 0.2.0 is the current stable release.

- Cloudflare Workers describes sandboxing as secure isolation plus API design, with isolates and stricter process-level controls where needed.

Sources:

- https://docs.wasmtime.dev/security.html

- https://wasi.dev/

- https://component-model.bytecodealliance.org/

- https://developers.cloudflare.com/workers/reference/security-model/