CVE-2026-58659: Lightningai Pytorch Lightning

High severity, CVSS 7.8. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Lightningai Pytorch Lightning: up to and including 2.6.5

Published 2026-07-15. Last modified 2026-10-08.