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WebAssembly

26 indexed repositories · View on GitHub

binaryen
Optimizer and compiler/toolchain library for WebAssembly

WebAssembly · 8628 stars
wabt
The WebAssembly Binary Toolkit

C++ · 8134 stars
WASI
WebAssembly System Interface

Rust · 5800 stars
spec
WebAssembly specification, reference interpreter, and test suite.

WebAssembly · 3453 stars
wasi-sdk
WASI-enabled WebAssembly C/C++ toolchain

CMake · 1640 stars
component-model
Repository for design and specification of the Component Model

WebAssembly · 1374 stars
proposals
Tracking WebAssembly proposals

1137 stars
wasi-libc
WASI libc implementation for WebAssembly

C · 1033 stars
threads
Threads and Atomics in WebAssembly

WebAssembly · 767 stars
meetings
WebAssembly meetings (VC or in-person), agendas, and notes

HTML · 548 stars
tool-conventions
Conventions supporting interoperatibility between tools working with WebAssembly.

WebAssembly · 372 stars
website
WebAssembly website

CSS · 287 stars
testsuite
Mirror of the spec testsuite

WebAssembly · 249 stars
wasi-webgpu

Rust · 220 stars
wasi-crypto
WASI Cryptography API Proposal

Makefile · 180 stars
js-promise-integration
JavaScript Promise Integration

WebAssembly · 119 stars
shared-everything-threads
A draft proposal for spawning threads in WebAssembly

WebAssembly · 97 stars
wasi-testsuite
WASI Testsuite

Rust · 88 stars
wasi-keyvalue

54 stars
wasi-messaging
Messaging proposal for WASI

33 stars
6 more repositories live on View on GitHub

Beginner friendly Everything

Open All

Require OCI-published artifacts as a part of the phase 2 acceptance criteria Open

proposal

WebAssembly/WASI#932 · 1 comment · 1 reaction · 1 assignee · Opened Jun 14, 2026
Supporting weaker memory orderings Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/acquire-release-atomics#2 · 2 comments · Opened Jun 5, 2026
Support separate acquire and release memory orderings Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/acquire-release-atomics#1 · Opened Jun 5, 2026
change gpu-flags-constant::all to be red | green | blue | alpha once WIT supports that Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

WebAssembly/wasi-webgpu#72 · Opened Jun 4, 2026
flags: support flags that are just combinations of other flags, not taking a new bit. Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

WebAssembly/component-model#660 · 6 comments · 1 reaction · Opened Jun 4, 2026
Port wasm2c to binaryen Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/wabt#2753 · 6 comments · 1 reaction · Opened Jun 1, 2026
wat2wasm/wast2json: assertion failure (!IsReferenceWithIndex()) parsing a typed reference in a GC struct/array field Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

WebAssembly/wabt#2750 · 1 comment · Opened Jun 1, 2026
Dart SIMD use case. Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/multibyte-array-access#5 · 5 comments · 1 reaction · Opened May 30, 2026
Add the ability for threads to manually set their "current task" Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/component-model#659 · 15 comments · Opened May 28, 2026
[Security] Out-of-bounds write in `MakeTypeBindingReverseMapping` via unchecked `local_index` from the binary `name` section Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

WebAssembly/wabt#2749 · 2 comments · Opened May 28, 2026
Missing validation error Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

WebAssembly/binaryen#8785 · 1 comment · Opened May 28, 2026
OOB read in wabt Interpreter Binary Reader Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

WebAssembly/wabt#2747 · Opened May 27, 2026
stream.forward/splice sketch Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/component-model#658 · 11 comments · Opened May 26, 2026
[wasm2c] Migrate to binaryen's existing hasher Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

WebAssembly/binaryen#8775 · Opened May 26, 2026
GPUCompilationMessage Using UTF-16 Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/wasi-webgpu#66 · 1 comment · Opened May 25, 2026
Assumptions for public types under --closed-world Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/binaryen#8754 · 11 comments · Opened May 21, 2026
Asyncify produces invalid IR for inner passes Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

WebAssembly/binaryen#8753 · Opened May 21, 2026
support.run_command ignores --no-fail-fast Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

WebAssembly/binaryen#8735 · Opened May 20, 2026
Proposal: wasi-media Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/WASI#917 · 10 comments · 2 reactions · Opened May 15, 2026
Slow reduction using delta debugging Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/binaryen#8712 · 18 comments · Opened May 15, 2026
Validator incorrectly rejects call_indirect to table of type `(ref null nofunc)` Open

WebAssembly/binaryen#8710 · 2 comments · 1 assignee · Opened May 15, 2026
TypeSSA could delete exactness Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/binaryen#8694 · Opened May 12, 2026
Global store-to-load forwarding Open

Difficulty 4/5 3-5 days Newbie friendliness 46/100

WebAssembly/binaryen#8691 · 6 comments · Opened May 12, 2026
Structured cloning of WebAssembly.Memory is not defined Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

WebAssembly/spec#2155 · 2 comments · Opened May 4, 2026
Idea: Content-Addressed Interface Verification for WASI (Hybrid Named/Anonymous Model) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/WASI#916 · 5 comments · Opened May 3, 2026
`-flto` + `-fwasm-exceptions` flags together break the compiler Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

WebAssembly/wasi-sdk#629 · 2 comments · 1 reaction · Opened May 1, 2026
Create and maintain the canonical JavaScript WASI P1 implementation Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/WASI#914 · Opened Apr 30, 2026
Heap Buffer OOB Write in wabt MakeTypeBindingReverseMapping Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

WebAssembly/wabt#2743 · Opened Apr 28, 2026
heap OOB read / SEGV in `BinaryWriter::WriteExpr` Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

WebAssembly/wabt#2742 · Opened Apr 25, 2026
Double rounding fix is (still) wrong in Windows Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

WebAssembly/spec#2150 · 1 comment · Opened Apr 23, 2026
Overloading of RMW and wait operations Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/shared-everything-threads#114 · 7 comments · Opened Apr 23, 2026
Optimization issue where allocation is not eliminated Open

WebAssembly/binaryen#8641 · 2 comments · 1 assignee · Opened Apr 22, 2026
configureAll builtin module needs updating Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

WebAssembly/custom-descriptors#100 · Opened Apr 22, 2026
Assertion failure `it != implicitTypes.end()` in wasm::WATParser::ParseModuleTypesCtx::makeTypeUse at contexts.h:1474 (main branch @3ef8d19) Open

WebAssembly/binaryen#8634 · 1 assignee · Opened Apr 21, 2026
heap-buffer-overflow in wasm::WATParser::Lexer::peek() at parser/lexer.h:137 (main branch @3ef8d19) Open

WebAssembly/binaryen#8632 · 1 assignee · Opened Apr 21, 2026
Branch hint fuzz bug with --code-pushing Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

WebAssembly/binaryen#8622 · 2 comments · Opened Apr 17, 2026
Improve effects analysis for indirect calls Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/binaryen#8615 · Opened Apr 16, 2026
wasi:filesystem - semantics of file descriptor without permissions Open

P-filesystem

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/WASI#912 · Opened Apr 16, 2026
wasi:filesystem - correct error when trying to escalate read permissions Open

P-filesystem

Difficulty 4/5 3-5 days Newbie friendliness 42/100

WebAssembly/WASI#911 · Opened Apr 16, 2026
proposals.md still points at the archived repos Open

Difficulty 1/5 1-3 hours Newbie friendliness 72/100

WebAssembly/WASI#909 · Opened Apr 13, 2026
Maybe switch to using views instead of arrays? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/multibyte-array-access#4 · 4 comments · Opened Apr 12, 2026
Support for all primitive array types (i16, u8, f32, etc.) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/multibyte-array-access#3 · 5 comments · Opened Apr 12, 2026
Underspecification of disallowing waits on the main thread Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

WebAssembly/threads#254 · Opened Apr 8, 2026
Importing console_log should not break the WebAssembly Compoenent Model Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/component-model#634 · 7 comments · Opened Apr 8, 2026
Memory64, multithreading and the 128-bit atomics operations to combat the ABA problem Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/threads#253 · 6 comments · Opened Apr 7, 2026
WIT: Import/Export inconsistencies Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/component-model#629 · 13 comments · Opened Apr 1, 2026
Using this repository as a submodule has a large git history Open

artifacts ci enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/wasi-testsuite#225 · 10 comments · Opened Apr 1, 2026
`Module.readBinary` use current spec as default feature set. Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

WebAssembly/binaryen#8560 · Opened Mar 31, 2026
Simplify JS-API test syncing Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/spec#2130 · 5 comments · Opened Mar 31, 2026
[wasm-interp] incorrect semantics in table.grow Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

WebAssembly/wabt#2734 · Opened Mar 31, 2026

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