Other namesProject OneFuzz
Initial releaseSeptember 18, 2020; 3 years ago (2020-09-18)
Final release
8.9.0 / October 9, 2023; 6 months ago (2023-10-09)
Written inRust, Python
Operating systemWindows, Linux
LicenseMIT License

OneFuzz is a cross-platform free and open source fuzz testing framework by Microsoft.[1] The software enables continuous developer-driven fuzz testing to identify weaknesses in computer software prior to release.[2]


OneFuzz is a self-hosted fuzzing-as-a-service platform that automates the detection of software bugs that could be security issues.[1] It supports Windows and Linux.[2]

Notable features include composable fuzzing workflows, built-in ensemble fuzzing, programmatic triage and result de-duplication, crash reporting notification callbacks, and on-demand live-debugging of found crashes.[3][2] The command-line interface client is written in Python 3, and targets Python 3.7 and up.[4]

Microsoft uses the OneFuzz testing framework to probe Edge, Windows and other products at the company.[1] It replaced the previous Microsoft Security Risk Detection software testing mechanism.[2]

The source code was released on September 18, 2020.[1] It is licensed under MIT License and hosted on GitHub.[5]

On August 31, 2023, it was announced that development would be coming to an end. On November 1, 2023, the GitHub project was archived.[5]

See also


  1. ^ a b c d "Microsoft: Windows 10 is hardened with these fuzzing security tools – now they're open source". ZDNet. September 15, 2020.
  2. ^ a b c d "Microsoft open-sources fuzzing test framework". InfoWorld. September 17, 2020.
  3. ^ "Microsoft's Security Group Open Sources Fuzzing Framework for Azure". September 22, 2020.
  4. ^ "OneFuzz- Microsoft Open Source Fuzzing Platform". September 19, 2020.
  5. ^ a b "GitHub - microsoft/onefuzz: A self-hosted Fuzzing-As-A-Service platform". November 1, 2023 – via GitHub.