Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00554-4
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Code runs in a strict sandbox where the only allowed operations are calling functions provided by the host. If the host doesn’t provide a file reading function, the WASM module simply cannot read files. The failure mode here requires a vulnerability in the WASM runtime itself, like an out-of-bounds memory read that bypasses the linear memory checks.
This post explores some of the fundamental issues I see with Web streams and presents an alternative approach built around JavaScript language primitives that demonstrate something better is possible.