[2603.24213] Uncovering Memorization in Timeseries Imputation models: LBRM Membership Inference and its link to attribute Leakage

Computer Science > Machine Learning arXiv:2603.24213 (cs) [Submitted on 25 Mar 2026] Title:Uncovering Memorization in Timeseries Imputation models: LBRM Membership Inference and its link to attribute Leakage Authors:Faiz Taleb, Ivan Gazeau, Maryline Laurent View a PDF of the paper titled Uncovering Memorization in Timeseries Imputation models: LBRM Membership Inference and its link to attribute Leakage, by Faiz Taleb and 1 other authors View PDF HTML (experimental) Abstract:Deep learning models for time series imputation are now essential in fields such as healthcare, the Internet of Things (IoT), and finance. However, their deployment raises critical privacy concerns. Beyond the well-known issue of unintended memorization, which has been extensively studied in generative models, we demonstrate that time series models are vulnerable to inference attacks in a black-box setting. In this work, we introduce a two-stage attack framework comprising: (1) a novel membership inference attack based on a reference model that improves detection accuracy, even for models robust to overfitting-based attacks, and (2) the first attribute inference attack that predicts sensitive characteristics of the training data for timeseries imputation model. We evaluate these attacks on attention-based and autoencoder architectures in two scenarios: models that are trained from scratch, and fine-tuned models where the adversary has access to the initial weights. Our experimental results demonstrate t...