arXiv:2610.41307v1 Announce Type: new Abstract: Multimodal indirect prompt injection embeds malicious instructions in external media that also contains information needed for the user's task. Existing defenses can block the attack yet impair the model's use of that information, leaving a gap between attack defense and task preservation. We propose ERASE, an on-policy self-distillation method that constructs its reference by erasing the injected region in place.
Erase the Injected Region: Multimodal Prompt-Injection Defense with On-Policy Self-Distillation
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