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Offline Code Vulnerability Scanner

by Md Abdur RahmanUpdated May 4, 2026

The Code Security Scanner MCP server lets developers scan Python, JavaScript, Java, or C++ code snippets for vulnerabilities like SQL injection, hardcoded secrets, command injection, and unsafe deserialization using the offline scan_code tool's heuristic rules. It delivers detailed reports with severity ratings, line numbers, and remediation steps for quick fixes. Test connectivity with the hello greeting or echo tool, all without internet access.

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Overview

The Code Security Scanner MCP server equips developers with an offline tool to detect security vulnerabilities and risky patterns in code snippets. It applies heuristic rules to identify threats like SQL injection, hardcoded secrets, command injection, weak cryptography, path traversal, and unsafe deserialization—all without internet access or external APIs. Run scans instantly in your local environment for confidential analysis on demand.

Key Capabilities

  • hello: Send a request to receive a greeting that confirms server connectivity and tool readiness.
  • echo: Input any text to get it mirrored back, verifying request parsing and troubleshooting interactions.
  • scan_code: Submit code snippets in Python, JavaScript, Java, or C++ to receive a report listing vulnerabilities with severity levels (low/medium/high), affected line numbers, explanations, and fixes like parameterized SQL queries or banning eval().

Use Cases

  1. Pre-commit checks: Feed a new function into scan_code to catch unescaped user input vulnerable to SQL injection, then implement parameterized queries before committing to git.
  2. Third-party code review: Inspect open-source libraries for hardcoded API keys or eval() usage, removing or replacing them securely before adding to your project.
  3. Legacy code audits: Examine old JavaScript for XSS risks from innerHTML assignments, obtaining a severity-ranked list to guide precise refactoring.
  4. CI/CD gates: Automate scan_code on pull request diffs to reject merges containing high-severity issues, such as C++ buffer overflows.

Who This Is For

Intermediate to advanced developers, application security engineers, and backend programmers handling Python, JavaScript, Java, or C++. It suits teams integrating quick vulnerability scans into code reviews, pair sessions, or prototypes, relying solely on local processing without external tools.