DiffuGuard: How Intrinsic Safety is Lost and Found in Diffusion Large Language Models - Li, Zherui; Nie, Zheng; Zhou, Zhenhong; Liu, Yue; Zhang, Yitong; Cheng, Yu; Wen, Qingsong; Wang, Kun; Guo, Yufei; Zhang, Jiaheng (International Conference on Learning Representations, 2026)