WebAssembly/wabt

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The WebAssembly Binary Toolkit

Stars: 8.1k
Forks: 827
Open beginner issues: 0
Indexed issues: 180
Avg merge: 4d 6h
Merged PRs (30d): 18

Dominant language: C++
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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180 open issues indexed

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
`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
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
(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
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
[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
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
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
[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
table.set index truncation Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

WebAssembly/wabt#2733 · Opened Mar 31, 2026
table.get index truncation for table64 Open

Difficulty 3/5 1-2 days Newbie friendliness 62/100

WebAssembly/wabt#2732 · Opened Mar 31, 2026
table.fill index truncation for table64 Open

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

WebAssembly/wabt#2731 · Opened Mar 31, 2026
incorrect table.copy in mixed table index types Open

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

WebAssembly/wabt#2730 · Opened Mar 31, 2026
incorrect memory.copy in mixed memory index types Open

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

WebAssembly/wabt#2729 · Opened Mar 31, 2026
wat2wasm demo seems a little outdated Open

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

WebAssembly/wabt#2711 · 2 comments · Opened Feb 27, 2026
Incorrect Index Validation for Recursive Function Types Open

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

WebAssembly/wabt#2710 · Opened Feb 26, 2026
Incorrect Type Index Validation for Implicit Function Signatures Open

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

WebAssembly/wabt#2709 · Opened Feb 26, 2026
https://webassembly.github.io/wabt/ 404? Open

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

WebAssembly/wabt#2682 · 1 comment · Opened Jan 14, 2026
Official release binaries build without WASI support? Open

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

WebAssembly/wabt#2680 · Opened Dec 19, 2025
[Bug] Heap-buffer-overflow in wabt::AST::InsertNode within wasm-decompile Open

sanitizer failures wasm-decompile

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

WebAssembly/wabt#2679 · 2 comments · Opened Dec 8, 2025
[Bug] Segmentation Fault (SEGV) in wabt::Decompiler::VarName within wasm-decompile Open

sanitizer failures wasm-decompile

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

WebAssembly/wabt#2678 · 3 comments · Opened Dec 8, 2025
[Bug] Assertion failed false in wabt::Decompiler::DecompileExpr Open

wasm-decompile

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

WebAssembly/wabt#2677 · 1 comment · Opened Dec 5, 2025
[Bug] Assertion failed type.IsReferenceWithIndex() in wabt::convertRefNullToRef Open

wasm-decompile

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

WebAssembly/wabt#2675 · 1 comment · Opened Dec 5, 2025
The version 1.0.39 can't decomplie normaly Open

wasm-decompile

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

WebAssembly/wabt#2671 · 1 comment · Opened Nov 22, 2025
AddressSanitizer: allocation-size-too-big ../../../../src/libsanitizer/asan/asan_new_delete.cpp:99 in operator new(unsigned long) Open

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

WebAssembly/wabt#2669 · Opened Nov 22, 2025
Automatic Updates Open

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

WebAssembly/wabt#2667 · 1 comment · Opened Nov 15, 2025
wabt only builds static libraries Open

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

WebAssembly/wabt#2665 · 3 comments · Opened Nov 11, 2025
Compiling WebAssembly 3.0 test cases fails Open

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

WebAssembly/wabt#2648 · 3 comments · 1 reaction · Opened Oct 4, 2025
`(ref null extern)` fails parsing Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

WebAssembly/wabt#2647 · 4 comments · Opened Oct 3, 2025
can't transfer http.wasm to wat Open

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

WebAssembly/wabt#2643 · 1 comment · Opened Sep 22, 2025
`macos-latest` builds are failing with `sigaltstack failed: Invalid argument` Open

help wanted

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

WebAssembly/wabt#2635 · 3 comments · Opened Sep 15, 2025
`--no-check` produces malformed module Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

WebAssembly/wabt#2629 · 4 comments · Opened Aug 31, 2025
wabt fails to build with GCC 15 Open

Difficulty 2/5 1-3 hours Newbie friendliness 42/100

WebAssembly/wabt#2628 · 2 comments · 1 reaction · Opened Aug 28, 2025
Does wabt-interp implement the latest WASM C API? Open

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

WebAssembly/wabt#2623 · Opened Jul 2, 2025
Missing branch hinting / code metadata support in Readme feature overview Open

Difficulty 1/5 Under an hour Newbie friendliness 68/100

WebAssembly/wabt#2615 · Opened Jun 9, 2025
[BUG] A heap-use-after-free in `wabt::interp::(anonymous namespace)::BinaryReaderInterp::GetFuncOffset(unsigned int)` at `src/interp/binary-reader-interp.cc:481:12` Open

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

WebAssembly/wabt#2614 · 1 comment · Opened Jun 6, 2025
wasm2c: stack overflow running on wasm2c with Windows 11 Open

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

WebAssembly/wabt#2612 · Opened Jun 1, 2025
The wasm2c command has no effect Open

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

WebAssembly/wabt#2609 · 6 comments · Opened May 26, 2025
The flag --enable-gc of wat2wasm has no effect. Open

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

WebAssembly/wabt#2606 · 7 comments · Opened May 21, 2025
[BUG] An out-of-memory in `wabt::interp::(anonymous namespace)::BinaryReaderInterp::OnDataCount(unsigned int)` at `src/interp/binary-reader-interp.cc:772:17` Open

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

WebAssembly/wabt#2598 · 1 comment · Opened May 13, 2025
Crash in SymbolTable::EnsureUnique when name is empty Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

WebAssembly/wabt#2595 · 3 comments · Opened May 5, 2025
[BUG] A SEGV in `wabt::interp::(anonymous namespace)::BinaryReaderInterp::OnExport(unsigned int, wabt::ExternalKind, unsigned int, std::__1::basic_string_view<char, std::__1::char_traits<char> >)` at `src/interp/binary-reader-interp.cc:693:63` Open

Difficulty 3/5 1-2 days Newbie friendliness 43/100

WebAssembly/wabt#2586 · Opened Apr 20, 2025
[BUG] A container-overflow in `wabt::interp::(anonymous namespace)::BinaryReaderInterp::BeginFunctionBody(unsigned int, unsigned long)` at `src/interp/binary-reader-interp.cc:829:22` Open

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

WebAssembly/wabt#2585 · Opened Apr 20, 2025
[BUG] Assertion `in_function_body` failed in function `LogOpcode` at `src/binary-reader-objdump.cc:661` Open

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

WebAssembly/wabt#2574 · 4 comments · Opened Mar 31, 2025
NULL Pointer Dereference in wabt::interp::(anonymous namespace)::BinaryReaderInterp::BeginFunctionBody Open

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

WebAssembly/wabt#2565 · 1 comment · Opened Mar 18, 2025
A Heap-based Buffer Overflow in wabt::interp::(anonymous namespace)::BinaryReaderInterp::GetReturnCallDropKeepCount Open

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

WebAssembly/wabt#2557 · 2 comments · Opened Mar 6, 2025

WebAssembly/wabt

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