High severity7.8OSV Advisory· Published Jul 15, 2026· Updated Aug 6, 2026
CVE-2026-58659
CVE-2026-58659
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.
Affected products
3- cpe:2.3:a:lightningai:pytorch_lightning:*:*:*:*:*:python:*:*Range: <=2.6.5
<=2.6.5+ 1 more
- (no CPE)range: <=2.6.5
- (no CPE)range: 2.6.4, 2.6.0, 2.5.0.post0, …
Patches
Vulnerability mechanics
References
4- github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86fnvdPatch
- github.com/Lightning-AI/pytorch-lightning/pull/21832nvdIssue TrackingPatch
- github.com/Lightning-AI/pytorch-lightning/issues/21822nvdExploitIssue TrackingMitigation
- www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameternvdExploitPatchThird Party Advisory
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