CISPA study shows latent multi-agent communication channels can push harmful compliance from 27.9 to 76.9
cispa · hf · 2026-10-01
CISPA researchers examine the safety of latent communication in multi-agent systems, where agents exchange information directly in representation space via lightweight trainable links instead of text, cutting token, compute, and latency overhead.
Key findings:
- Even benignly trained links increase harmful compliance in safety-aligned agents without changing agent weights.
- Attackers can amplify this by optimizing links on harmful query–response pairs or poisoning training data; the team also presents an RL attack that rewards harmful compliance alongside benign performance without needing harmful target responses.
- Across three communication topologies and four safety benchmarks, the attack raises mean harmful-compliance from 27.9 to 76.9, while achieving higher benign utility than direct supervised optimization.
- Repair is possible by steering rewards toward safer behavior, substantially reducing harmful compliance without updating agents. Safety alignment must treat the multi-agent system as a whole.
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