googleprojectzero/fuzzilli

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A JavaScript Engine Fuzzer

Stars: 2.3k
Forks: 367
Open beginner issues: 0
Indexed issues: 62
Avg merge: 23h 53m
Merged PRs (30d): 1

Dominant language: Swift
License: Apache-2.0
Last GitHub push: Sep 16, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

Beginner friendly Everything

Open All

62 open issues indexed

Crash Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

googleprojectzero/fuzzilli#556 · Opened May 5, 2026
fuzzying 2M+ consistent crash with this same instruction Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

googleprojectzero/fuzzilli#555 · Opened Apr 20, 2026
Fatal error: Unknown frame type in `DiffOracle.parseFrameType` during differential execution (DumplingDiffOracle) Open

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

googleprojectzero/fuzzilli#552 · Opened Apr 14, 2026
Assertion failure in scheduleCorpusImport with --jobs>=2 Open

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

googleprojectzero/fuzzilli#551 · 1 comment · Opened Apr 11, 2026
NJS Fuzz BUILD Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

googleprojectzero/fuzzilli#548 · 1 comment · Opened Feb 10, 2026
Large RLIMIT_NOFILE causes application hang Open

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

googleprojectzero/fuzzilli#540 · 1 comment · Opened Nov 13, 2025
Build Failure on Linux (Swift 5.10.1): [[ Missing Darwin APIs sequence counting and type errors Open

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

googleprojectzero/fuzzilli#539 · 2 comments · Opened Nov 13, 2025
ran into gn issue `No value named "exec_script_whitelist" in scope "build_dotfile_settings"` building fuzzilli in Docker Open

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

googleprojectzero/fuzzilli#537 · Opened Nov 4, 2025
Assertion failure in `ProgramBuilder.swift:2003` when fuzzing SpiderMonkey Open

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

googleprojectzero/fuzzilli#533 · 1 comment · Opened Oct 16, 2025
Make WASM Function Signature Support `ref concrete heap type` Open

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

googleprojectzero/fuzzilli#525 · 1 comment · Opened Sep 8, 2025
Don't start fuzzilli Open

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

googleprojectzero/fuzzilli#517 · 1 comment · Opened Jul 6, 2025
Odd ubsan issue when building on macOS Open

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

googleprojectzero/fuzzilli#516 · Opened Jul 3, 2025
Questions about ExplorationMutator Open

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

googleprojectzero/fuzzilli#508 · Opened Apr 2, 2025
Optimizing weights through the MAB algorithm Open

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

googleprojectzero/fuzzilli#506 · 2 comments · Opened Mar 21, 2025
User/homedir expansion doesn't work Open

Difficulty 2/5 1-3 hours Newbie friendliness 40/100

googleprojectzero/fuzzilli#504 · 1 comment · Opened Mar 2, 2025
Windows Support Open

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

googleprojectzero/fuzzilli#503 · 1 comment · Opened Feb 25, 2025
Compile error Open

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

googleprojectzero/fuzzilli#499 · 3 comments · Opened Feb 8, 2025
The comment incorrectly describes the direction of anonymous shared memory() usage Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

googleprojectzero/fuzzilli#495 · Opened Feb 2, 2025
Mapping identifier names based on variable declaration kind Open

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

googleprojectzero/fuzzilli#494 · Opened Jan 23, 2025
Crash on Wsl2 Ubuntu 22.04 Open

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

googleprojectzero/fuzzilli#493 · 2 comments · Opened Jan 20, 2025
Consider introducing `reassignedInputs` section of an Instruction's inouts Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 38/100

googleprojectzero/fuzzilli#492 · Opened Jan 3, 2025
Experiment with JavaScriptLifter inlining heuristic that tries to avoid additional brackets Open

enhancement

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

googleprojectzero/fuzzilli#491 · Opened Dec 31, 2024
Allow arbitrary expressions in object and class fields Open

enhancement

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

googleprojectzero/fuzzilli#490 · Opened Dec 31, 2024
Distinguish between function expressions and function declarations Open

enhancement

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

googleprojectzero/fuzzilli#489 · Opened Dec 31, 2024
JSLifter Nested String Lifting Bug Open

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

googleprojectzero/fuzzilli#487 · Opened Dec 30, 2024
Lack of LoadGlobal Opcode despite documentation Open

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

googleprojectzero/fuzzilli#484 · 2 comments · Opened Dec 24, 2024
Spidermonkey, Crash Case fails Open

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

googleprojectzero/fuzzilli#482 · 1 comment · Opened Dec 14, 2024
Lifting Problem from FuzzIL to JS Open

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

googleprojectzero/fuzzilli#480 · 1 comment · Opened Dec 7, 2024
Code Generation of complex parameter types Open

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

googleprojectzero/fuzzilli#459 · Opened Nov 7, 2024
Problems related to tracking data dependencies during fuzzing Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

googleprojectzero/fuzzilli#457 · 4 comments · Opened Oct 28, 2024
Bugfix + Feature Request for Compiler/Parser Open

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

googleprojectzero/fuzzilli#456 · Opened Oct 27, 2024
Feature problem: yieldEach Open

Difficulty 3/5 1-2 days Newbie friendliness 40/100

googleprojectzero/fuzzilli#453 · 4 comments · Opened Oct 14, 2024
Feature problem: Cyclic __proto__ value Open

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

googleprojectzero/fuzzilli#452 · 2 comments · Opened Oct 14, 2024
Feature problem: Top-level prototype assignment Open

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

googleprojectzero/fuzzilli#451 · 2 comments · Opened Oct 14, 2024
Problem Compiling JSC using fuzzbuild.sh Open

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

googleprojectzero/fuzzilli#450 · 2 comments · Opened Oct 10, 2024
about Instruction flags set .noRemovable Open

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

googleprojectzero/fuzzilli#446 · Opened Sep 13, 2024
Switch Case Problem Open

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

googleprojectzero/fuzzilli#441 · Opened Aug 13, 2024
Improve FuzzIL Compiler Open

enhancement good first issue

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

googleprojectzero/fuzzilli#437 · 1 comment · Opened Jul 22, 2024
Some features miss Open

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

googleprojectzero/fuzzilli#433 · 1 comment · Opened May 13, 2024
False Positive (or unreproducible) Cases Open

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

googleprojectzero/fuzzilli#426 · 1 comment · Opened Mar 24, 2024
may remove this assert Open

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

googleprojectzero/fuzzilli#424 · Opened Mar 11, 2024
bug unhandle VariableDeclaration if left is Array Open

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

googleprojectzero/fuzzilli#418 · 1 comment · Opened Feb 18, 2024
Unknown property key type: StringLiteral Open

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

googleprojectzero/fuzzilli#416 · 2 comments · Opened Feb 5, 2024
Assertion failed: Expected variable declaration as init part of a for-in loop, found Identifier Open

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

googleprojectzero/fuzzilli#412 · 1 comment · Opened Jan 17, 2024
Unhandled node type SwitchStatement Open

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

googleprojectzero/fuzzilli#411 · 1 comment · Opened Jan 17, 2024
swift run start error Open

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

googleprojectzero/fuzzilli#403 · 1 comment · Opened Aug 31, 2023
FuzzILTool Error Open

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

googleprojectzero/fuzzilli#399 · 5 comments · Opened May 26, 2023
[Fuzzer] Testcase "fuzzilli('FUZZILLI_CRASH', {0 | 1 | 2})" did not crash Open

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

googleprojectzero/fuzzilli#391 · 8 comments · Opened Apr 11, 2023
Exploration Failure Crashes Open

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

googleprojectzero/fuzzilli#390 · Opened Apr 9, 2023
SpiderMonkey start fatal error Open

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

googleprojectzero/fuzzilli#388 · 3 comments · Opened Mar 10, 2023

googleprojectzero/fuzzilli

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