CVE-2026-31221: Lightningai Pytorch Lightning

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

PyTorch-Lightning versions 2.6.0 and earlier contain an insecure deserialization vulnerability (CWE-502) in the checkpoint loading mechanism. The LightningModule.load_from_checkpoint() method, which is commonly used to load saved model states, internally calls torch.load() without setting the security-restrictive weights_only=True parameter. This default behavior allows the deserialization of arbitrary Python objects via the Pickle module. A remote attacker can exploit this by providing a maliciously crafted checkpoint file, leading to arbitrary code execution on the victim's system when the file is loaded.

Affected products

• Lightningai Pytorch Lightning: up to and including 2.6.0

Published 2026-05-12. Last modified 2026-06-17.