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manuelbrandner85
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variant-analysis

Identify recurring vulnerability patterns across codebases using incremental abstraction techniques.

Updated Nov 23, 2025
Search Tags:#security#vulnerability#audit#codeql#semgrep#taint-analysis
One-click install
npx skills add https://github.com/manuelbrandner85/Weltenbibliothekapp --skill variant-analysis-manuelbrandner85
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: variant-analysis
Source: https://github.com/manuelbrandner85/Weltenbibliothekapp/tree/main/.agents/skills/variant-analysis
Command: npx skills add https://github.com/manuelbrandner85/Weltenbibliothekapp --skill variant-analysis-manuelbrandner85

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill solves the challenge of finding recurring security vulnerabilities across a codebase after an initial bug has been identified, preventing the same mistake from existing in multiple locations.

Core Features & Use Cases

  • Pattern Generalization: Provides a structured methodology to evolve an exact-match search into a broader semantic query.
  • Multi-Tool Integration: Offers templates and guidance for using ripgrep, Semgrep, and CodeQL to perform deep security audits.
  • Use Case: After discovering a SQL injection in one API handler, use this Skill to systematically audit the entire codebase for similar string concatenation patterns in database queries.

Quick Start

Use the variant-analysis skill to help me build a Semgrep rule that identifies all instances of user-controlled input reaching a system command sink in my Python project.

Frequently Asked Questions about variant-analysis

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

FAQPage Schema
How do I find recurring vulnerability variants across a large codebase?▼

Variant analysis identifies recurring vulnerability patterns across large codebases by generalizing an exact-match bug discovery into broader semantic queries to locate similar security flaws.

What is the best way to build a Semgrep rule for taint analysis after finding a bug?▼

You can build a Semgrep rule by using pattern generalization techniques, transitioning from exact-match search to comprehensive semantic analysis to track user-controlled input reaching system sinks.

How does CodeQL compare to ripgrep for conducting a security audit?▼

This skill integrates templates for both: ripgrep offers fast text-based pattern matching while CodeQL provides deep semantic taint analysis for comprehensive security audits and false-positive management.

Can I use this to create CI-ready security rules for automated vulnerability triage?▼

Yes, this skill facilitates rigorous vulnerability triage and guides the creation of automated CI-ready security rules by systematically tracking recurring vulnerability patterns across your codebase.

What is semantic pattern generalization for finding security vulnerabilities?▼

Semantic pattern generalization is an incremental abstraction technique that evolves an exact-match search into a broader semantic query to hunt all variants of a known vulnerability.

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