When Compression Becomes an Attack Surface: Black-Box Attacks on Prompt-Compressed LLM Agents

📰 ArXiv cs.AI

Learn how compression can become an attack surface for LLM agents and how to defend against black-box attacks

advanced Published 23 Jun 2026
Action Steps
  1. Identify potential attack surfaces in LLM agents using prompt compression
  2. Analyze the effects of compression on trusted and untrusted inputs
  3. Develop strategies to defend against black-box attacks on compressed LLM agents
  4. Implement robust testing and validation protocols for compressed LLM agents
  5. Apply adversarial training techniques to improve the resilience of compressed LLM agents
Who Needs to Know This

AI researchers and developers working with LLM agents can benefit from understanding the potential vulnerabilities of prompt compression, while security teams can learn how to defend against these attacks

Key Insight

💡 Compression can create a new attack surface for LLM agents by discarding task-critical evidence or safety guardrails

Share This
🚨 Compression can become an attack surface for LLM agents! 🚨 Learn how to defend against black-box attacks #LLM #AIsecurity

Key Takeaways

Learn how compression can become an attack surface for LLM agents and how to defend against black-box attacks

Full Article

Title: When Compression Becomes an Attack Surface: Black-Box Attacks on Prompt-Compressed LLM Agents

Abstract:
arXiv:2510.22963v4 Announce Type: replace-cross Abstract: Prompt compression is increasingly deployed in LLM agents to reduce latency and cost, but it also determines what the backend LLM ultimately sees. We show that, when trusted and untrusted inputs are compressed under a shared budget, this lossy transformation creates a new attack surface: by perturbing only untrusted inputs before compression, an adversary can cause the compressor to discard task-critical evidence or safety guardrails befo
Read full paper → ← Back to Reads

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