CVE-2026-31221

Description

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.

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Produits concernés

• Lightningai pytorch lightning

Scores CVSS

Faiblesses (CWE)

• CWE-502

Références

• https://github.com/Lightning-AI/pytorch-lightning Product
• https://www.notion.so/CVE-2026-31221-35d1e1393188815f8db7c4fd08076639 ExploitThird Party Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories