Fuzz testing is a well-known technique for uncovering programming errors in software. Many of these detectable errors, like buffer overflow, can have serious security implications. Google has found thousands of security vulnerabilities and stability bugs by deploying guided in-process fuzzing of Chrome components, and we now want to share that service with the open source community.
In cooperation with the Core Infrastructure Initiative and the OpenSSF, OSS-Fuzz aims to make common open source software more secure and stable by combining modern fuzzing techniques with scalable, distributed execution. Projects that do not qualify for OSS-Fuzz (e.g. closed source) can run their own instances of ClusterFuzz or ClusterFuzzLite.
We support the libFuzzer, AFL++, and Honggfuzz fuzzing engines in combination with Sanitizers, as well as ClusterFuzz, a distributed fuzzer execution environment and reporting tool.
Currently, OSS-Fuzz supports C/C++, Rust, Go, Python, Java/JVM, and JavaScript code. Other languages supported by LLVM may work too. OSS-Fuzz supports fuzzing x86_64 and i386 builds.
Read our detailed documentation to learn how to use OSS-Fuzz.
As of May 2025, OSS-Fuzz has helped identify and fix over 13,000 vulnerabilities and 50,000 bugs across 1,000 projects.
- 2024年11月20日 - Leveling Up Fuzzing: Finding more vulnerabilities with AI
- 2023年08月16日 - AI-Powered Fuzzing: Breaking the Bug Hunting Barrier
- 2023年02月01日 - Taking the next step: OSS-Fuzz in 2023
- 2022年09月08日 - Fuzzing beyond memory corruption: Finding broader classes of vulnerabilities automatically
- 2021年12月16日 - Improving OSS-Fuzz and Jazzer to catch Log4Shell
- 2021年03月10日 - Fuzzing Java in OSS-Fuzz
- 2020年12月07日 - Improving open source security during the Google summer internship program
- 2020年10月09日 - Fuzzing internships for Open Source Software
- 2018年11月06日 - A New Chapter for OSS-Fuzz
- 2017年05月08日 - OSS-Fuzz: Five months later, and rewarding projects
- 2016年12月01日 - Announcing OSS-Fuzz: Continuous fuzzing for open source software