When Alignment Isn't Enough: Response-Path Attacks on LLM Agents

📰 ArXiv cs.AI

Learn how response-path attacks can compromise LLM agents, even with perfect alignment, and why end-to-end integrity is crucial

advanced Published 5 May 2026
Action Steps
  1. Identify potential vulnerabilities in BYOK agent architectures
  2. Analyze the threat of post-alignment tampering on LLM responses
  3. Implement end-to-end integrity measures to prevent response-path attacks
  4. Test and evaluate the security of LLM agents against tampering threats
  5. Develop strategies to mitigate the risks of malicious relays in BYOK architectures
Who Needs to Know This

AI researchers and developers working with LLM agents and BYOK architectures need to understand this vulnerability to ensure the security and integrity of their systems

Key Insight

💡 End-to-end integrity is essential to prevent post-alignment tampering and ensure the security of LLM agents

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🚨 Response-path attacks can compromise LLM agents, even with perfect alignment! 🚨

Key Takeaways

Learn how response-path attacks can compromise LLM agents, even with perfect alignment, and why end-to-end integrity is crucial

Full Article

Title: When Alignment Isn't Enough: Response-Path Attacks on LLM Agents

Abstract:
arXiv:2605.02187v1 Announce Type: cross Abstract: Bring-Your-Own-Key (BYOK) agent architectures let users route LLM traffic through third-party relays, creating a critical integrity gap: a malicious relay can modify an aligned LLM response after generation but before agent execution. We formalize this post-alignment tampering threat and show that, without end-to-end integrity, the relay can observe, suppress, or replace downstream messages, making even perfectly aligned LLMs ineffective against
Read full paper → ← Back to Reads

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