GitHub Advisory Database15 days ago

Wasmtime: Bit-packing in Cranelift compiler causes silent overflow and miscompilation

Summary In Wasmtime prior to v43, the Cranelift compiler backend bit-packs its SSA value indices in a way that can result in silent overflow in release builds, and result in incorrect value references in the IR resulting in arbitrary miscompilation. A very large Wasm function bod

Published October 23, 2026 · 10:02 PM
Summary In Wasmtime prior to v43, the Cranelift compiler backend bit-packs its SSA value indices in a way that can result in silent overflow in release builds, and result in incorrect value references in the IR resulting in arbitrary miscompilation. A very large Wasm function bod
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Source: GitHub Advisory Database

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