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async: missing "in waitable set" trap in sync {stream,future}.cancel-{read,write} and subtask.cancel

bugIncorrect behavior in the current implementation that needs fixingIncorrect behavior in the current implementation that needs fixing

Status: Open.

#13690 In bytecodealliance/wasmtime;

· lukewagner opened on Jun 18, 2026

Wasmtime does not trace suspended component fibers/threads for stack roots

wasm-proposal:component-model-asyncIssues related to the WebAssembly Component Model async proposalIssues related to the WebAssembly Component Model async proposal

wasm-proposal:component-threadingIssues related to cooperative threading in the component modelIssues related to cooperative threading in the component model

wasm-proposal:gcIssues with the implementation of the gc wasm proposalIssues with the implementation of the gc wasm proposal

Status: Open.

#13676 In bytecodealliance/wasmtime;

· alexcrichton opened on Jun 17, 2026

Possible to drop a future writable end without ever writing

wasm-proposal:component-model-asyncIssues related to the WebAssembly Component Model async proposalIssues related to the WebAssembly Component Model async proposal

Status: Open.

#13661 In bytecodealliance/wasmtime;

· alexcrichton opened on Jun 16, 2026

component-model-error-context: Buggy (?) host can trigger incorrect reference counting

wasm-proposal:component-modelIssues related to the WebAssembly Component Model proposalIssues related to the WebAssembly Component Model proposal

wasm-proposal:component-model-error-contextRelated to the error-context feature of componentsRelated to the error-context feature of components

Status: Open.

#13652 In bytecodealliance/wasmtime;

· alexcrichton opened on Jun 15, 2026

Changing Wasmtime's versioning for unreleased branches

ci

Status: Open.

#13622 In bytecodealliance/wasmtime;

· alexcrichton opened on Jun 12, 2026

Include pkg-config support

Status: Open.

#13611 In bytecodealliance/wasmtime;

· gor-gyolchanyan opened on Jun 11, 2026

Stack switching: host-ward unwind (proc_exit / trap) after a resume double-frees a fiber stack (44.0.0 + 45.0.0)

wasm-proposal:stack-switchingIssues related to WebAssembly stack switchingIssues related to WebAssembly stack switching

Status: Open.

#13584 In bytecodealliance/wasmtime;

· Nymphium opened on Jun 6, 2026

Continuous Sightglass benchmarking

Status: Open.

#13576 In bytecodealliance/wasmtime;

· fitzgen opened on Jun 5, 2026

Is differential fuzzing the spec interpreter still worth it?

fuzzingIssues related to our fuzzing infrastructureIssues related to our fuzzing infrastructure

Status: Open.

#13561 In bytecodealliance/wasmtime;

· alexcrichton opened on Jun 4, 2026

Cranelift: magic division and remainder optimization can slow down execution time

bugIncorrect behavior in the current implementation that needs fixingIncorrect behavior in the current implementation that needs fixing

craneliftIssues related to the Cranelift code generatorIssues related to the Cranelift code generator

Status: Open.

#13554 In bytecodealliance/wasmtime;

· bongjunj opened on Jun 4, 2026

WASIp1 semantic ambiguity with overlapping preopened directories can break POSIX path equivalence

wasiIssues pertaining to WASIIssues pertaining to WASI

Status: Open.

#13544 In bytecodealliance/wasmtime;

· MacroModel opened on Jun 3, 2026

Incremental GC for copying collector performs synchronous work on drop

wasm-proposal:gcIssues with the implementation of the gc wasm proposalIssues with the implementation of the gc wasm proposal

Status: Open.

#13530 In bytecodealliance/wasmtime;

· alexcrichton opened on Jun 1, 2026