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variant-analysis

Hunt for similar vulnerabilities across codebases using pattern-based analysis.

1|Updated Jan 31, 2026
Search Tags:#security#code audit#variant analysis#codeql#semgrep#vulnerability hunting
One-click install
npx skills add https://github.com/allanninal/claude-code-skills --skill variant-analysis-allanninal
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: variant-analysis
Source: https://github.com/allanninal/claude-code-skills/tree/main/skills/variant-analysis
Command: npx skills add https://github.com/allanninal/claude-code-skills --skill variant-analysis-allanninal

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) and scripts (resource) components.

What problem does it solve?

This Skill helps you systematically find similar vulnerabilities and bugs across codebases by leveraging pattern-based analysis, especially after an initial issue has been identified.

Core Features & Use Cases

  • Variant Hunting: Efficiently search for code patterns similar to a known vulnerability.
  • Query Building: Assist in creating or refining Semgrep and CodeQL queries for security patterns.
  • Audit Support: Aid in systematic code audits by generalizing from a specific bug.
  • Use Case: After discovering a SQL injection vulnerability in one part of an application, use this Skill to search the entire codebase for other instances where user input might reach database queries without proper sanitization.

Quick Start

Use the variant-analysis skill to find patterns similar to the provided code snippet.

Frequently Asked Questions about variant-analysis

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

FAQPage Schema
What is variant analysis in security auditing?▼

Variant analysis systematically hunts for similar vulnerabilities across a codebase after identifying an initial bug. It generalizes the root cause of a known security issue into a pattern to find other instances of the same flaw.

How do I find similar vulnerabilities after discovering a bug?▼

You find similar vulnerabilities by performing root cause analysis on the initial bug and iteratively generalizing its code pattern. You then apply this generalized pattern to search the entire codebase for other instances of similar unsafe data flows or operations.

Can I use this approach to build Semgrep and CodeQL queries?▼

Yes, variant analysis assists in creating and refining Semgrep and CodeQL queries. By generalizing the pattern of a known vulnerability, you can develop precise static analysis queries to detect similar security issues across your code.

Does variant analysis require understanding root cause analysis?▼

Yes, variant analysis requires a solid understanding of root cause analysis and iterative pattern generalization. You need this foundational knowledge to accurately extract the core vulnerability pattern from the initial bug and apply it effectively to find variants.

What is the best way to audit a codebase for variants of a known SQL injection?▼

The best way is to use pattern-based variant analysis to search the entire codebase for similar data flows. You generalize the specific SQL injection pattern to find other instances where user input might reach database queries without proper sanitization.

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