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atheris

Official

Coverage-guided fuzzing for Python apps

Software Engineering#python#fuzzing#harness#atheris#asan#c-extension#libFuzzer
AuthorSuperlend
Version1.0.0
Installs0

System Documentation

What problem does it solve?

Atheris provides a ready-to-use, coverage-guided fuzzing workflow for Python code and native extensions, helping teams discover crashes, memory-safety issues, and edge-case bugs early in development.

Core Features & Use Cases

  • Coverage-guided fuzzing for pure Python code and Python C extensions using libFuzzer and AddressSanitizer.
  • Harness guidance and instrumentation with atheris.instrument_func and atheris.instrument_imports for high coverage.
  • Docker-based, reproducible environments with a complete clang/toolchain setup for safe fuzzing in CI or local environments.
  • Real-world use cases include fuzzing Python libraries, validating C extensions, and testing complex input parsing to prevent crashes or security issues.

Quick Start

Build and run the fuzzing environment using the provided Docker workflow:

  1. Build: docker build -t atheris .
  2. Run: docker run -it atheris
  3. Verify: python -c "import atheris; print(atheris.version)" Then create a small harness, instrument it with atheris, and start fuzzing your target function.

Dependency Matrix

Required Modules

None required

Components

Standard package

💻 Claude Code Installation

Recommended: Let Claude install automatically. Simply copy and paste the text below to Claude Code.

Please help me install this Skill:
Name: atheris
Download link: https://github.com/Superlend/superloop-core-contracts/archive/main.zip#atheris

Please download this .zip file, extract it, and install it in the .claude/skills/ directory.
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