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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86f Patch
- https://github.com/Lightning-AI/pytorch-lightning/issues/21822 Exploit, Issue Tracking, Mitigation
- https://github.com/Lightning-AI/pytorch-lightning/pull/21832 Issue Tracking, Patch
- https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameter Exploit, Patch, Third Party Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.4 · lightningaiNVD modified 2026-10-08 16:17
Affected (CPE criteria) 1
cpe:2.3:a:lightningai:pytorch_lightning:*:*:*:*:*:python:*:*
References 4
- https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86f Patch
- https://github.com/Lightning-AI/pytorch-lightning/issues/21822 Exploit, Issue Tracking, Mitigation
- https://github.com/Lightning-AI/pytorch-lightning/pull/21832 Issue Tracking, Patch
- https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameter Exploit, Patch, Third Party Advisory