ClusterFuzz is a scalable fuzzing
infrastructure that finds security and stability issues in software.
Google uses ClusterFuzz to fuzz the Chrome Browser and as the fuzzing
backend for OSS-Fuzz.
ClusterFuzz provides many features which help seamlessly integrate fuzzing into
a software project's development process:
- Highly scalable. Google's internal instance runs on over 25,000 machines.
- Accurate deduplication of crashes.
- Fully automatic bug filing and closing for issue trackers
(Monorail only for now).
- Testcase minimization.
- Regression finding through bisection.
- Statistics for analyzing fuzzer performance, and crash rates.
- Easy to use web interface for management and viewing crashes.
- Firebase authentication.
- Support for coverage guided fuzzing (e.g. libFuzzer and AFL) and blackbox
You can find detailed documentation here.
As of January 2019, ClusterFuzz has found ~16,000 bugs
in Chrome and ~11,000 bugs in over 160 open source projects integrated with
You can file an issue to ask
questions, request features, or ask for help.
Staying Up to Date
We will use clusterfuzz-announce(#)googlegroups.com to make announcements about ClusterFuzz.