The Hidden State Attack: Why Your LLM's System Prompt Isn't Secret

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Executive Summary Vulnerability Class : Hidden State Information Leakage Severity : Medium-High (context-dependent) Attack Surface : Debug endpoints, multi-tenant GPU memory, on-device models Impact : Full recovery of system prompts, few-shot examples, and conversation history Mitigation : Available (see Defenses section) The Discovery While researching transformer interpretability, I discovered…

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