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The Show-Up Attack: When Subagents Win Over Their Supervisor

Maosen Zhang, Jianshuo Dong, Yutong Zhang, Jie Zhang, Tianwei Zhang, Han Qiu · 2026 · arXiv

DOI: 10.48550/arXiv.2610.27574 · open-access PDF

French

Cependant, cela crée également de nouvelles surfaces d'attaque: les agents malveillants peuvent avoir des chances d'exploiter la coordination. Dans ce document, nous proposons et étudions l'attaque \textit{show-up attack}, dans laquelle un sous-agent malveillant manipule le superviseur pour l'impliquer dans des tâches au-delà de sa portée attribuée. Pour évaluer ce risque, nous proposons SUA-Arena, qui met en œuvre 6 stratégies d'attaque et contient 188 cas de test. Ensuite, nous évaluons 6 LLM frontaliers et constatons qu'ils sont tous vulnérables aux attaques de show-up.

Machine translation (Meta M2M100); the English original follows.

Abstract

Multi-agent systems are increasingly deployed to coordinate multiple large language model (LLM) agents. However, this also creates new attack surfaces: malicious agents may have chances to exploit the coordination. In this paper, we propose and study the \textit{show-up attack}, in which a malicious subagent manipulates the supervisor into involving it in tasks beyond its assigned scope. To evaluate this risk, we propose SUA-Arena, which implements 6 attack strategies and contains 188 test cases. Then, we evaluate 6 frontier LLMs and find that all of them are vulnerable to show-up attacks. For

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