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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

Investigate adding a "fast init" function for initializing the VMContext

enhancement

performance

wasmtimeIssues about wasmtime that don't fall into another labelIssues about wasmtime that don't fall into another label

Status: Open.

#13502 In bytecodealliance/wasmtime;

· alexcrichton opened on May 28, 2026

Deduplicate translation of constant expressions and general operators in func_environ.rs

enhancement

wasmtimeIssues about wasmtime that don't fall into another labelIssues about wasmtime that don't fall into another label

Status: Open.

#13501 In bytecodealliance/wasmtime;

· alexcrichton opened on May 28, 2026