What are MCP servers used for?

They bridge LLMs to your tools—files, DBs, shells—for real-world actions.

How do I fix command injection in my MCP server?

Ditch shell=True, use arg lists; validate all inputs with Pydantic.

Are MCP servers safe for production?

Not yet—43% audited were vulnerable. Run these 22 checks first.

Will these 22 checks stop all attacks?

No silver bullet, but they plug the obvious holes 90% of hackers hit.

🔒 Security & Privacy

Audited 50 MCP Servers: 43% Hackable in Minutes. 22 Fixes That Work

I tore through 50 open-source MCP servers last month—43% spat out command injection holes wide enough for a semi-truck. Here's the no-BS list of 22 checks to keep your AI tools from owning your infra.

theAIcatchup Apr 08, 2026 4 min read

Terminal screenshot auditing vulnerable MCP server code with red exploit highlights

⚡ Key Takeaways

43% of audited MCP servers had command injection flaws—fix with no-shell args and Pydantic schemas. 𝕏
Path traversal and SSRF are LLM specialties; validate paths, block internal hosts. 𝕏
Run non-root, log everything, and fuzz-test—MCP's the new Log4Shell vector. 𝕏

Published by

theAIcatchup

Community-driven. Code-first.

#LLM security #MCP servers #command injection #path traversal #prompt injection #subprocess vulnerabilities

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Originally reported by Dev.to

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