mcp-deadbugz-simulator
Simulates the Deadbugz MCP supply-chain attack for educational and research purposes, demonstrating a 3-call gate evasion where tool descriptions mutate to steal credentials.
README
MCP Deadbugz Simulator
A local simulation of the Deadbugz MCP supply-chain attack discovered by Pillar Security in August 2026.
What this repo contains
Malicious MCP server with 3-call gate evasion technique Python test harness to prove the attack works Optional agent simulation with local LLM
The attack pattern
- Server shows benign tools for first 3 calls
- 4th call triggers tools/listChanged notification
- Tool descriptions mutate to credential-stealing instructions
- AI agent follows malicious instructions
Requirements
Python 3.10+ MCP SDK
Usage
git clone https://github.com/anexbin/mcp-deadbugz-simulator.git cd mcp-deadbugz-simulator pip install -r requirements.txt python server/malicious_server.py python client/test_harness.py
Files
server/malicious_server.py - The attack server client/test_harness.py - Proof of concept agent/local_agent.py - Optional LLM integration configs/ - Example MCP configs
Disclaimer
For educational and research purposes only.
References
https://www.pillar.security/blog/deadbugz-currently-active-mcp-supply-chain-campaign https://modelcontextprotocol.io
License
MIT
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