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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

Anonymous union as a specialization of variant to support common web APIs Open

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

WebAssembly/component-model#724 · 9 comments · Opened Sep 17, 2026
[http] deprecate `request-options` `first-byte-timeout` Open

P-http proposal

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

WebAssembly/WASI#962 · Opened Sep 11, 2026
[http] Request and Response's `new` method is reserved in many languages, inconsistent with sockets. Open

Difficulty 2/5 1-3 hours Newbie friendliness 75/100

WebAssembly/WASI#961 · Opened Sep 10, 2026
Half precision floats Open

Difficulty 3/5 1-2 days Newbie friendliness 50/100

WebAssembly/multibyte-array-access#8 · 1 comment · Opened Sep 10, 2026
`wasm32-wasip3` with `flto` traps Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

WebAssembly/wasi-sdk#657 · 1 comment · Opened Sep 9, 2026
🪙 Value text encoding ambiguities / quirks Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

WebAssembly/component-model#718 · 1 comment · Opened Sep 9, 2026
Zero-sized literal output buffers cause out-of-bounds access Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

WebAssembly/wabt#2851 · Opened Sep 9, 2026
Incomplete analysis for the states of global integer variables that does not eliminate excessive equality checks Open

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

WebAssembly/binaryen#9086 · 2 comments · Opened Sep 9, 2026
`HUGE_VAL` and `HUGE_VALF` are not constant expressions on AIX Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

WebAssembly/wabt#2849 · Opened Sep 8, 2026
`compact imports` broken Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

WebAssembly/wabt#2845 · 1 comment · Opened Sep 6, 2026
[spectec] Wasm 1.0: `$instantiate` missing premises Open

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

WebAssembly/spec#2245 · Opened Sep 4, 2026
[Triage] P-http backlog sweep Open

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

WebAssembly/WASI#958 · Opened Sep 3, 2026
Incorrect implementations of unreachable `ref.as_non_null` validation Open

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

WebAssembly/spec#2235 · 9 comments · Opened Aug 28, 2026
shared objects: user space initialization safety Open

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

WebAssembly/shared-everything-threads#119 · 2 comments · Opened Aug 28, 2026
More precise livenes analysis for locals under Asyncify Open

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

WebAssembly/binaryen#9038 · 5 comments · Opened Aug 24, 2026
Custom section (before …)/(after …) placement is parsed but ignored Open

Difficulty 4/5 3-5 days Newbie friendliness 56/100

WebAssembly/wabt#2834 · Opened Aug 24, 2026
Most lit/help tests fail with new python-filecheck Open

Difficulty 2/5 Half a day Newbie friendliness 76/100

WebAssembly/binaryen#9018 · 3 comments · Opened Aug 19, 2026
(CVE-2026-90648) vulnerability in wasm2c: tail call to a local function uses an uninitialised module instance pointer Open

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

WebAssembly/wabt#2831 · 1 comment · Opened Aug 19, 2026
Should libwabt.js and libwabt.wasm be published on npm? Open

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

WebAssembly/wabt#2827 · 4 comments · Opened Aug 17, 2026
ctor-eval/flatten_overflow.wast lit test fails on x86 32-bit Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

WebAssembly/binaryen#9006 · 2 comments · Opened Aug 15, 2026
wasm2c from binaryen conflicts with wasm2c from wabt Open

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

WebAssembly/binaryen#9002 · 4 comments · Opened Aug 13, 2026
Register your interest in hosting an in-person CG meeting Open

Difficulty 1/5 Under an hour Newbie friendliness 35/100

WebAssembly/meetings#2112 · Opened Aug 13, 2026
WIT: declare as a package-scope type, apply with `@annotate` Open

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

WebAssembly/component-model#695 · 1 comment · Opened Aug 12, 2026
WIT: allow type declarations at package scope Open

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

WebAssembly/component-model#694 · 1 comment · Opened Aug 12, 2026
Dynamic linking, threading, and cross-library TLS Open

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

WebAssembly/tool-conventions#270 · 14 comments · Opened Aug 10, 2026
Consider specifying what should happen when sending a `request` with `path-with-query: none` and `authority` set Open

P-http

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

WebAssembly/WASI#949 · Opened Aug 6, 2026
[1.0] Replace `wasi:http@0.3` `handler` / `client` split with single interface using `implements` Open

P-http proposal

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

WebAssembly/WASI#948 · Opened Aug 6, 2026
Parse bug with extra non-nullable br_on_cast values Open

Difficulty 3/5 1-2 days Newbie friendliness 54/100

WebAssembly/binaryen#8949 · Opened Jul 29, 2026
Contradicting `SOL_TCP` and `SOL_UDP` definition for p1 Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/wasi-libc#855 · 1 comment · Opened Jul 28, 2026
[Pre-proposal] State Continuity Profiles for WebAssembly Components Open

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

WebAssembly/WASI#946 · 1 comment · Opened Jul 27, 2026
In-place encryption/decryption for WIT Open

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

WebAssembly/wasi-crypto#95 · Opened Jul 27, 2026
Asyncify the API Open

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

WebAssembly/wasi-keyvalue#68 · Opened Jul 22, 2026
Champions status Open

Difficulty 1/5 Under an hour Newbie friendliness 25/100

WebAssembly/wasi-keyvalue#67 · 5 comments · Opened Jul 22, 2026
p3(http): Consider specifying the list of definitely forbidden field names Open

P-http

Difficulty 5/5 Over a week Newbie friendliness 38/100

WebAssembly/WASI#940 · 3 comments · Opened Jul 17, 2026
Provide a synchronous constructor for non-empty streams Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

WebAssembly/component-model#677 · 1 comment · Opened Jul 16, 2026
Fuzzer generates invalid code for table initializers Open

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

WebAssembly/binaryen#8911 · 1 comment · Opened Jul 15, 2026
Investigate why `wasm-merge` + `wasm-opt` output is larger than the corresponding monolithic module processed with `wasm-opt` Open

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

WebAssembly/binaryen#8910 · 1 comment · Opened Jul 15, 2026
Possible extension: useful casts for source-level nominal types Open

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

WebAssembly/custom-descriptors#107 · 1 comment · 1 reaction · Opened Jul 13, 2026
wasm-opt [parse exception: popping from empty stack (at 0:543)] Open

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

WebAssembly/binaryen#8896 · 2 comments · Opened Jul 12, 2026
MIT licensing state is unhealthy Open

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

WebAssembly/wasi-libc#815 · 1 comment · Opened Jul 6, 2026
`proposals/http/wit/deps.toml` should list random Open

P-http

Difficulty 1/5 Under an hour Newbie friendliness 90/100

WebAssembly/WASI#937 · Opened Jul 4, 2026
How exactly should wasi:filesystem `open-flags` and `descriptor-flags` interact with native open modes/flags? Open

P-filesystem

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

WebAssembly/WASI#936 · 1 comment · Opened Jul 1, 2026
coop-threads: The open-posix-test-suite conformance tests take a long time to run Open

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

WebAssembly/wasi-libc#809 · 2 comments · Opened Jun 30, 2026
Recognize table initialization code in start function and be able to devirtualize based on it Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

WebAssembly/binaryen#8869 · 4 comments · Opened Jun 26, 2026
Consider ways to make WIT files more discoverable Open

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

WebAssembly/WASI#934 · Opened Jun 23, 2026
Reloc entries for downstream tools for expressions outside the code and data sections Open

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

WebAssembly/tool-conventions#269 · Opened Jun 23, 2026
wasi-sdk-33.0 undefined symbols when building with c++ exceptions Open

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

WebAssembly/wasi-sdk#639 · 1 comment · Opened Jun 23, 2026
[spectec] Missing and wrong side conditions in the middle-end Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/spec#2196 · Opened Jun 23, 2026
wasi:filesystem alternative - force guests to do all path resolution Open

P-filesystem

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

WebAssembly/WASI#933 · 13 comments · 1 reaction · Opened Jun 20, 2026
strip errors for ComponentizeJS output Open

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

WebAssembly/wasi-sdk#638 · Opened Jun 19, 2026

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