Real-World Agent Injection Attack and Defense Platform
quasarzero0000 · reddit · 2026-07-16
Introducing a free Indirect Prompt Injection Arena: Tantalus, designed to teach and train real-world agentic security, moving beyond pointless jailbreak exercises like making chatbots swear.
The core design offers a realistic environment: an AI assistant has access to files, emails, and chat logs, featuring both normal and poisoned tools. Players must trick it into exfiltrating sensitive data from a user workstation, learning how agent systems are exploited via prompt injection in the real world.
The platform features two rounds:
- Round 1: Equipped with three layers of common industry guardrails that players must bypass.
- Round 2: Provides only poisoned data and features a deliberately vulnerable agent, but removes Round 1's defenses, replacing them with a control in the generation stream that allegedly prevents 100% of data exfiltration.
The author notes that these statistical conclusions are drawn from their research and the platform's own trials, and no player has successfully cleared Round 2 yet.
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