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Do Input-Level Defenses Transfer to Observation-Level Attacks on VideoLLMs?

arXiv · AI, language, vision and robotics · article · Sep 8, 2026 · UTC

Video Large Language Models (VideoLLMs) are increasingly deployed in safety-critical applications such as content moderation and video analytics. To process long videos efficiently, VideoLLMs rely on frame sampling, token compression, and modality fusion, which together form an observation pipeline that reduces the raw video to a compact internal representation. Recent observation-level attacks exploit this pipeline to prevent the model from perceiving harmful content, yet no defense has been explicitly designed for this threat. We introduce DefTEval, a controlled evaluation framework that sys

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Evidence & attribution

First collected: 2026-09-20T20:22:01.598Z. This is not the publication date.