Wasmtime is an open source runtime for WebAssembly & WASI. In Wasmtime from and there was a use-after-free bug when passing
externrefs from the host to guest Wasm content. To trigger the bug, you have to explicitly pass multiple
externrefs from the host to a Wasm instance at the same time, either by passing multiple
externrefs as arguments from host code to a Wasm function, or returning multiple
externrefs to Wasm from a multi-value return function defined in the host.