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Fuzzinator Random Testing Framework
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Random Testing Framework

Fuzzinator is a fuzzing framework that helps you to automate tasks usually needed during a fuzz session:

  • run your favorite test generator and feed the test cases to the system-under-test,
  • catch and save the unique issues,
  • reduce the failing test cases,
  • ease the reporting of issues in bug trackers (e.g., Bugzilla or GitHub),
  • regularly update SUTs if needed, and
  • schedule multiple SUTs and generators without overloading your workstation.

All the above features are fully customizable either by writing a simple config file or by implementing Python snippets to cover special needs. Check out some slides about Fuzzinator for a general overview, or see the Tutorial for a detailed walk-through on the config files.

To help tracking the progress of the fuzzing, Fuzzinator provides two interfaces:

  • an interactive TUI (supported on Linux and Mac OS X) that gives a continuously updated overview about the currently running tasks, statistics about the efficacy of the test generators, and the found issues (and also supports reporting them); and
  • a dump-mode (supported on every platform) that displays the news on line-based consoles.

Although Fuzzinator itself doesn't come with test generators (except for an example random character sequence generator), you can find a list of useful generators in the wiki.


  • Python >= 3.4
  • pip and setuptools Python packages (the latter is automatically installed by pip)
  • MongoDB (either local installation or access to remote database)


The quick way:

pip install fuzzinator

Alternatively, by cloning the project and running setuptools:

python install


A common form of Fuzzinator's usage:

fuzzinator --tui --utf8 <path/to/the/config.ini>


Fuzzinator was tested on:

  • Linux (Ubuntu 14.04 / 16.04 / 18.04)
  • Mac OS X (El Capitan 10.11 / Sierra 10.12 / High Sierra 10.13 / Mojave 10.14)

Acknowledgement and Citations

The authors are immensely grateful to Dr. Heinz Doofenshmirtz for the continuous inspiration.

Background on Fuzzinator is published in (R. Hodovan, A. Kiss: "Fuzzinator: An Open-Source Modular Random Testing Framework", ICST 2018).

Copyright and Licensing

Licensed under the BSD 3-Clause License.

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