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PYSEC-2026-3624
Details
PyTorch Lightning through 2.6.5, fixed in commit d710d68, contains a remote code execution vulnerability in the _load_state function that imports and executes attacker-controlled module names from checkpoint _instantiator hyperparameters. Attackers can craft malicious checkpoint files that bypass weights_only=True protections to execute arbitrary code when LightningModule.load_from_checkpoint is called.
Are you affected?
Enter the version of the package you're using.
Affected packages
PyPI/lightning
Introduced in:
0No fixed version published yet for lightning (pip). Pin to a known-safe version or switch to an alternative.
References
- https://github.com/Lightning-AI/pytorch-lightning/issues/21822[REPORT]
- https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86f[FIX]
- https://github.com/Lightning-AI/pytorch-lightning/pull/21832[FIX]
- https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameter[FIX]