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Soundness issue with StringPool cloning

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

Status: Open.

#12905 In bytecodealliance/wasmtime;

· flavio opened on Mar 31, 2026

HostBodyStreamProducer::poll_produce returns StreamResult::Completed without producing items, causing a trap on WASI HTTP response body reads

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

Status: Open.

#12903 In bytecodealliance/wasmtime;

· karthik-phl opened on Mar 31, 2026

Spurious networking-related failures

ci

Status: Open.

#12895 In bytecodealliance/wasmtime;

· alexcrichton opened on Mar 30, 2026

gc_ops fuzzer failure: assertion failed: self.is_well_formed(limits)

fuzz-bugBugs found by a fuzzerBugs found by a fuzzer

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

Status: Open.

#12892 In bytecodealliance/wasmtime;

· alexcrichton opened on Mar 30, 2026

Cranelift: Value labels for displaying IR

Status: Open.

#12863 In bytecodealliance/wasmtime;

· vxpm opened on Mar 28, 2026

Epoch interruption of memory.atomic.wait* instructions

wasm-proposal:threadsIssues related to the WebAssembly threads proposalIssues related to the WebAssembly threads proposal

Status: Open.

#12809 In bytecodealliance/wasmtime;

· Destructor17 opened on Mar 20, 2026

Using csdb in JTSequence on macOS arm64 can be a 2x or more performance penalty

cranelift:area:aarch64Issues related to AArch64 backend.Issues related to AArch64 backend.

Status: Open.

#12789 In bytecodealliance/wasmtime;

· alexcrichton opened on Mar 16, 2026

Signal handler violates async-signal-safety by calling malloc via TLS access

Status: Open.

#12787 In bytecodealliance/wasmtime;

· jbachorik opened on Mar 16, 2026

cpp-api: WasmType/Val does not handle endianness conversions from native types on big-endian platforms

wasmtime:c-apiIssues pertaining to the C API.Issues pertaining to the C API.

Status: Open.

#12784 In bytecodealliance/wasmtime;

· leonm1 opened on Mar 16, 2026

c-api: gc feature unconditionally enabled in wasmtime crate

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

wasmtime:c-apiIssues pertaining to the C API.Issues pertaining to the C API.

Status: Open.

#12783 In bytecodealliance/wasmtime;

· leonm1 opened on Mar 16, 2026

Illegal instruction on arm64 Android, when the wasi-http response body is larger.

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

wasmtime:platform-supportRelated to supporting a new platform in WasmtimeRelated to supporting a new platform in Wasmtime

Status: Open.

#12778 In bytecodealliance/wasmtime;

· Heap-Hop opened on Mar 14, 2026

Debugging: tracking issue for MVP and post-MVP work

wasmtime:debuggingIssues related to debugging of JIT'ed codeIssues related to debugging of JIT'ed code

Status: Open.

#12777 In bytecodealliance/wasmtime;

· cfallin opened on Mar 13, 2026