Issues

• Cranelift: missed optimization Improve divisibility test by constant

  cranelift:goal:optimize-speedcranelift
  bytecodealliance/wasmtime#14699 · Filter by author Takashiidobe opened on Oct 13, 2026

• Cranelift: missed optimization for simplifying trapping arithmetic

  bugcranelift:goal:optimize-speedcranelift
  bytecodealliance/wasmtime#14694 · Filter by author Takashiidobe opened on Oct 13, 2026

• Cranelift: miscompile on aarch64 w/o lse when expected value has garbage upper bits

  bugcranelift:area:aarch64cranelift
  bytecodealliance/wasmtime#14693 · Filter by author Takashiidobe opened on Oct 13, 2026
  1

• Cranelift: miscompile on RV64, swizzle x, (splat y) doesn't properly zero extend

  bugcranelift:area:riscv64cranelift
  bytecodealliance/wasmtime#14691 · Filter by author Takashiidobe opened on Oct 13, 2026

• Error contexts sent through futures/streams aren't reference-counted

  bugwasm-proposal:component-model-error-context
  bytecodealliance/wasmtime#14674 · Filter by author alexcrichton opened on Oct 12, 2026
  1

• VMContext layout misaligns func_refs when a module defines an odd number of tags

  bug
  bytecodealliance/wasmtime#14671 · Filter by author elliekorn opened on Oct 12, 2026

• Error contexts have no limit on their debug message size

  bugwasm-proposal:component-model-error-context
  bytecodealliance/wasmtime#14669 · Filter by author alexcrichton opened on Oct 12, 2026

• Cranelift: x86_64 lowering i8 multiply with mulb could be optimized

  cranelift:area:x64enhancement
  bytecodealliance/wasmtime#14660 · Filter by author Takashiidobe opened on Oct 11, 2026

• Instantiation of modules with large element segments into imported tables regressed ~7x since #13487

  performance
  bytecodealliance/wasmtime#14616 · Filter by author veeshi opened on Oct 8, 2026
  1

• Add GC heap developer tools for profiling and debugging

  enhancementwasm-proposal:gc
  bytecodealliance/wasmtime#14615 · Filter by author fitzgen opened on Oct 8, 2026

• wasmtime -g panics on wasm file from specific handcrafted wast

  bugwasmtime:debugging
  bytecodealliance/wasmtime#14609 · Filter by author mcclure opened on Oct 7, 2026
  3

• Pulley and s390x don't correctly handle the youngest frame in a stack-overflow trace

  bugcranelift:area:s390xpulley
  bytecodealliance/wasmtime#14597 · Filter by author alexcrichton opened on Oct 6, 2026

• Incorrect out-of-bounds traps with memory-may-move=n and imported memories

  bug
  bytecodealliance/wasmtime#14587 · Filter by author alexcrichton opened on Oct 6, 2026

• CoW initialization of memories incorrectly happens when element segments are out-of-bounds

  bug
  bytecodealliance/wasmtime#14585 · Filter by author alexcrichton opened on Oct 6, 2026

• Panic when a shared memory has an out-of-bounds fault

  bugwasm-proposal:threads
  bytecodealliance/wasmtime#14584 · Filter by author alexcrichton opened on Oct 6, 2026

• gc_ops fuzzbug: Table::grow panics on an unrooted Rooted init value instead of returning Err

  bugfuzz-bugwasm-proposal:gc
  bytecodealliance/wasmtime#14582 · Filter by author khagankhan opened on Oct 6, 2026
  1

  

• MPK: Segfault running an Engine on a preexisting thread

  bugwasmtime:pooling-allocator
  bytecodealliance/wasmtime#14581 · Filter by author alexcrichton opened on Oct 6, 2026
  1

• Internal do_no_suspend flag not correctly managed for sync-typed-tasks

  bugwasm-proposal:component-model-async
  bytecodealliance/wasmtime#14576 · Filter by author alexcrichton opened on Oct 6, 2026
  1

• riscv64: Model Zve capabilities for embedded vector support

  cranelift:area:riscv64enhancement
  bytecodealliance/wasmtime#14575 · Filter by author dotcom07 opened on Oct 6, 2026
  1

• Debug tags on try_call are dropped during lowering; guest-debug breakpoints fire unrequested with inlining

  bugcranelift:area:clifwasmtime:debugging
  bytecodealliance/wasmtime#14571 · Filter by author fitzgen opened on Oct 6, 2026
  1

• GC: Allow single-byte memory pages

  enhancementwasm-proposal:gc
  bytecodealliance/wasmtime#14523 · Filter by author simolus3 opened on Oct 4, 2026
  2

• Stack-switching ops loses fuel accounting

  bugwasm-proposal:stack-switchingwasmtime:fuel
  bytecodealliance/wasmtime#14509 · Filter by author alexcrichton opened on Oct 3, 2026

• WASI implementation uses openat2 syscall restricted by Seccomp on Android

  bug
  bytecodealliance/wasmtime#14496 · Filter by author Destructor17 opened on Oct 2, 2026
  1

• wasi-nn: host memory disclosure via get_output before inference

  bugwasi-nn
  bytecodealliance/wasmtime#14437 · Filter by author karalabe opened on Sep 28, 2026
  4

• Accounting for component conversion work in an execution fuel budget

  wasmtime:fuel
  bytecodealliance/wasmtime#14430 · Filter by author wilfreddenton opened on Sep 25, 2026
  6