Adaptive Adversaries: A Multi-Turn, Multi-LLM Benchmark for LLM Agent Security
LLM-based agents process external content, exposing them to prompt injection and multi-turn manipulation. We present a 21-scenario benchmark for adaptive cross-session attacks against fresh-session LLM defenders: an autonomous LLM attacker observes prior defender responses and pivots across rounds, while each defender response is evaluated as a fresh interaction. A controlled 3 x 3 attacker-defender matrix contains 945 battles. Restricting scoring to the first round yields 0-1% attack success rate (ASR); allowing 15 rounds yields 7.9-16.8%. Pooling three attacker LLMs uncovers 1.7-2.2 times as many unique successful inputs as the best single attacker, at three times the battle budget. Agg...
| Authors | Devina Jain, David Hartmann, Chuan Li |
|---|---|
| Primary category | cs.CR |
| Published | 20 July 2026 |
| Last updated at source | 11 September 2026 |
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