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home / skills / jeremylongshore / claude-code-plugins-plus-skills / insecure-deserialization-checker

insecure-deserialization-checker skill

/skills/03-security-fundamentals/insecure-deserialization-checker

This skill helps automate insecure deserialization checks by providing step-by-step guidance, production-ready code, and validation against security best

npx playbooks add skill jeremylongshore/claude-code-plugins-plus-skills --skill insecure-deserialization-checker

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SKILL.md
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---
name: "insecure-deserialization-checker"
description: |
  Validate insecure deserialization checker operations. Auto-activating skill for Security Fundamentals.
  Triggers on: insecure deserialization checker, insecure deserialization checker
  Part of the Security Fundamentals skill category. Use when working with insecure deserialization checker functionality. Trigger with phrases like "insecure deserialization checker", "insecure checker", "insecure".
allowed-tools: "Read, Write, Grep, Bash(npm:*)"
version: 1.0.0
license: MIT
author: "Jeremy Longshore <[email protected]>"
---

# Insecure Deserialization Checker

## Overview

This skill provides automated assistance for insecure deserialization checker tasks within the Security Fundamentals domain.

## When to Use

This skill activates automatically when you:
- Mention "insecure deserialization checker" in your request
- Ask about insecure deserialization checker patterns or best practices
- Need help with essential security skills covering authentication, input validation, secure coding practices, and basic vulnerability detection.

## Instructions

1. Provides step-by-step guidance for insecure deserialization checker
2. Follows industry best practices and patterns
3. Generates production-ready code and configurations
4. Validates outputs against common standards

## Examples

**Example: Basic Usage**
Request: "Help me with insecure deserialization checker"
Result: Provides step-by-step guidance and generates appropriate configurations


## Prerequisites

- Relevant development environment configured
- Access to necessary tools and services
- Basic understanding of security fundamentals concepts


## Output

- Generated configurations and code
- Best practice recommendations
- Validation results


## Error Handling

| Error | Cause | Solution |
|-------|-------|----------|
| Configuration invalid | Missing required fields | Check documentation for required parameters |
| Tool not found | Dependency not installed | Install required tools per prerequisites |
| Permission denied | Insufficient access | Verify credentials and permissions |


## Resources

- Official documentation for related tools
- Best practices guides
- Community examples and tutorials

## Related Skills

Part of the **Security Fundamentals** skill category.
Tags: security, authentication, validation, owasp, secure-coding

Overview

This skill automates validation and guidance for insecure deserialization checker tasks in the Security Fundamentals domain. It provides actionable checks, recommended fixes, and sample code or configuration snippets to reduce deserialization-related risks. The skill is auto-activated when insecure deserialization concerns are mentioned and integrates security best practices into development workflows.

How this skill works

It inspects code patterns, configuration settings, and runtime behaviors that commonly enable insecure deserialization, then reports findings with severity and remediation steps. The skill suggests input validation, safe serialization libraries, integrity checks (signing), and configuration hardening, and can produce example fixes or templates. Outputs include validation results, code snippets, and recommended configuration changes aligned with common standards.

When to use it

  • You suspect insecure deserialization vulnerabilities in an application or library.
  • You need automated guidance when reviewing object serialization/deserialization code paths.
  • Preparing a security review, pentest preparation, or automated CI checks for deserialization risks.
  • When implementing or migrating serialization libraries and wanting safer defaults.
  • Training developers on quick fixes and best practices for deserialization-related issues.

Best practices

  • Validate and whitelist deserialized types rather than trusting incoming type information.
  • Use proven, secure serialization libraries that disable polymorphic type resolution or require explicit allowlists.
  • Apply integrity checks: sign and/or encrypt serialized payloads to detect tampering.
  • Enforce strict input size limits and perform canonicalization before deserialization.
  • Run static and runtime checks in CI/CD to catch insecure patterns early and include remediation guidance.

Example use cases

  • Scan a service that consumes serialized objects from untrusted sources and get prioritized remediation steps.
  • Generate a safe example using JSON-based serialization and explicit type mapping to replace unsafe binary deserializers.
  • Add CI pipeline checks that fail builds when unsafe deserialization patterns are detected.
  • Produce configuration and code snippets demonstrating payload signing and allowlisting of deserializable classes.
  • Create a developer-facing checklist for secure deserialization during code reviews.

FAQ

What does the skill flag as insecure deserialization?

It flags patterns like unchecked polymorphic deserialization, use of insecure binary serializers, deserializing data from untrusted origins without validation, and missing integrity checks.

Can it generate production-ready fixes?

Yes. The skill produces concise, production-ready code and configuration examples following industry best practices, but you should review them to match your project constraints and security policies.