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Banner: PyTorch 2.6 torch.load rejecting checkpoints with unsupported pickled objects

Security Bug Report

PyTorch 2.6 torch.load fails: Weights only load failed, Unsupported global

Ryan Pham · Mar 5, 2025 · 6 min read

After upgrading to PyTorch 2.6, every checkpoint load in our evaluation pipeline failed with Weights only load failed. The default for weights_only in torch.load flipped to True, and our checkpoints contained a NumPy scalar. We fixed the checkpoints instead of turning the safety off.