atheris

separate

Sets up and runs Atheris, the coverage-guided Python fuzzer built on libFuzzer. Covers TestOneInput harnesses, FuzzedDataProvider, instrumenting both pure Python and native C extensions, and running under AddressSanitizer. Use when fuzzing a Python package, hunting memory corruption in a Python C extension, or choosing between Atheris and Hypothesis for a Python target.

When to use

Fuzzing pure Python code with coverage guidance
Testing Python C extensions for memory corruption
Integration with libFuzzer ecosystem is desired
AddressSanitizer support is needed

When not to use

Property-based testing
AFL-style fuzzing

Skill page

Source

Repository	Path
trailofbits/skills	`plugins/testing-handbook-skills/skills/atheris/SKILL.md`