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4.6K Stars 467 Forks Apache License 2.0 1.9K Commits 192 Opened issues


Scalable fuzzing infrastructure.

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ClusterFuzz is a scalable fuzzing infrastructure that finds security and stability issues in software.

Google uses ClusterFuzz to fuzz all Google products 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. Can run on any size cluster (e.g. OSS-Fuzz instance runs on 100,000 VMs). - Accurate deduplication of crashes. - Fully automatic bug filing, triage and closing for various issue trackers (e.g. Monorail, Jira). - Supports multiple coverage guided fuzzing engines for optimal results (with ensemble fuzzing and fuzzing strategies). - Support for blackbox fuzzing. - Testcase minimization. - Regression finding through bisection. - Statistics for analyzing fuzzer performance, and crash rates. - Easy to use web interface for management and viewing crashes. - Support for various authentication providers using Firebase.



You can find detailed documentation here.


As of February 2021, ClusterFuzz has found ~29,000 bugs in Google (e.g. Chrome) and 26,000+ bugs in over 400 open source projects integrated with OSS-Fuzz.

Getting Help

You can file an issue to ask questions, request features, or ask for help.

Staying Up to Date

We will use clusterfuzz-announce(#) to make announcements about ClusterFuzz.

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