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.