Preprint
Aug 2026
When Do PEFT Adaptations Leak Structure? Measuring Black-Box Structural Bounds in Public-Base Model Services
The results show that known-base, rich-output PEFT services can leak actionable structural and version information, while closed-set confidence alone does not establish universal adapter recovery.
Zhongjiang Yao, Shuangshuang Liang, Chun Yang et al.
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