Grizzly
Grizzly is a modular general purpose browser fuzzing framework. The goal is to create a platform that can be extended via the creation of plug-ins to support multiple combinations of browsers and fuzzers. An Adapter is used to add support for a fuzzer and a Target to add support for a browser. Generated test cases are intended to be standalone and not require Grizzly.
Cross platform compatibility is available for Windows, Linux and MacOS. However not all features may be available.
For additional information please check out the wiki or the announcement.
Quick Start
Install the latest version from PyPI. For more details see getting started on the wiki.
python3 -m pip install grizzly-framework --upgrade
Fuzzing - Run the no-op test adapter to check everything is working.
grizzly <browser-binary> no-op
Reduce - Grizzly Reduce can reduce a test case.
grizzly-reduce <browser-binary> <testcase>
Replay - Grizzly Replay can replay a test case with different builds and debuggers.
grizzly-replay <browser-binary> <testcase>
Bugzilla is also supported by Grizzly Replay. Bugs can be replayed via a bug ID:
grizzly-replay-bugzilla <browser-binary> <bug_id>
Questions
Common questions can be found on the Q&A page. Questions can also be asked in the #fuzzing channel.
Please be sure you are using the latest version Grizzly before reporting issues.
2 maintainers
Metadata
2 maintainers
Release files for grizzly-framework 1.3.1
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| grizzly_framework-1.3.1.tar.gz | 236.5 kB | With provenance | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| grizzly_framework-1.3.1-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 539.4 kB
Release files / grizzly_framework-1.3.1.tar.gz
| Download URL | grizzly_framework-1.3.1.tar.gz |
|---|---|
| Size | 236.5 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
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twine/7.0.0 CPython/3.13.14
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Transparency logRelease files / grizzly_framework-1.3.1-py3-none-any.whl
| Download URL | grizzly_framework-1.3.1-py3-none-any.whl |
|---|---|
| Size | 302.9 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
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BLAKE2b-256 checksum How to use checksums |
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Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 19, 2026.
Transparency logSecurity for grizzly-framework 1.3.1
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
Full provenance
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Attestation for grizzly_framework-1.3.1.tar.gz
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 19, 2026.
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