Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Lightningai | Pytorch Lightning | <= 2.6.5 |
Related Weaknesses (CWE)
References
- https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3Patch
- https://github.com/Lightning-AI/pytorch-lightning/issues/21822ExploitIssue TrackingMitigation
- https://github.com/Lightning-AI/pytorch-lightning/pull/21832Issue TrackingPatch
- https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-ExploitPatchThird Party Advisory
FAQ
What is CVE-2026-58659?
CVE-2026-58659 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 che...
How severe is CVE-2026-58659?
CVE-2026-58659 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-58659?
Check the references section above for vendor advisories and patch information. Affected products include: Lightningai Pytorch Lightning.