Authors

Junjian Li

Publications 2

Preprint Open access

Cooldown Landmines: Cross-Tenant Interference Attacks on LLM Gateways

Yudong Gao, Linghan Chen, Wenhan Wu et al. · 2026

LLM gateways enforce separate tenant quotas while sharing model deployments and cooldown records that temporarily exclude failing backends. However, a tenant's request failure can update these shared records and restrict other tenants' access to serviceable deployments. We identify two attacks that exploit this gap in …

Preprint Open access

Learning Normal Diffusion Dynamics for Backdoor Defense in Text-to-Image Models

Junjian Li, Xiaolong Liu, Peng Sun et al. · 2026

Backdoor attacks pose a serious threat to the secure deployment of text-to-image (T2I) diffusion models. Existing defenses typically detect backdoors from specific abnormal patterns in internal representations, which may limit their generalizability with the emergence of increasingly diverse attack mechanisms. In this …

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