CVE-2026-58659
PyTorch Lightning Arbitrary Code Execution via _instantiator Hyperparameter
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-470 |
| Vendor | lightning-ai |
| Product | pytorch-lightning |
| Published | Jul 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Lightning-AI / pytorch-lightning
0 ≤ 2.6.5
References
github.com: https://github.com/Lightning-AI/pytorch-lightning/issues/21822 github.com: https://github.com/Lightning-AI/pytorch-lightning/pull/21832 github.com: https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86f vulncheck.com: https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameter
Credits
George Chen