atheris

Automate coverage-guided fuzzing to discover bugs in Python code and C extensions.

Updated Feb 13, 2026
One-click install
npx skills add https://github.com/fjor1025/InfoSec-Framework --skill atheris-fjor1025
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: atheris
Source: https://github.com/fjor1025/InfoSec-Framework/tree/main/ClaudeSkills/plugins/testing-handbook-skills/skills/atheris
Command: npx skills add https://github.com/fjor1025/InfoSec-Framework --skill atheris-fjor1025

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers find bugs and security vulnerabilities in Python code and its C extensions by automatically generating diverse inputs to test code paths.

Core Features & Use Cases

  • Coverage-guided fuzzing: Automatically explores code paths based on execution coverage.
  • Python & C Extension Support: Fuzzes both pure Python code and native C/C++ extensions.
  • Use Case: A developer can use Atheris to automatically discover memory corruption bugs or unexpected crashes in a Python library they are developing, ensuring greater stability and security.

Quick Start

Use the atheris skill to fuzz the provided python script 'fuzz.py'.

Frequently Asked Questions about atheris

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I find memory corruption bugs in Python C extensions?

To find memory corruption bugs in Python C extensions, you can use coverage-guided fuzzing. This approach automatically generates diverse inputs to test code paths and integrates with libFuzzer for native memory corruption detection.

What is coverage-guided fuzzing for Python code?

Coverage-guided fuzzing for Python code is a testing technique that automatically explores code paths based on execution coverage. It generates diverse inputs to discover unexpected crashes and security vulnerabilities in pure Python scripts and native extensions.

Do I need clang to fuzz Python C extensions?

Yes, you need clang and specific environment variables to fuzz Python C extensions. Native extension fuzzing requires clang to compile the code and integrate with libFuzzer for memory corruption detection.

Can I fuzz pure Python code without native C extensions?

Yes, you can fuzz pure Python code without native C extensions. The fuzzer targets both pure Python scripts and native C extensions to discover bugs and security vulnerabilities across your entire Python library.

What Python version is required for automated bug discovery?

Python 3.7 or higher is required for automated bug discovery using coverage-guided fuzzing. This ensures compatibility with the fuzzing framework and its integration with libFuzzer for C extensions.