CVE-2026-58659
8.4
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Lightning-AI | pytorch-lightning | 0 <= 2.6.5 | affected |
| Lightning-AI | pytorch-lightning | d710d689510d50e800f53b3cd773cbca20b1f86f | unaffected |
Weaknesses
- CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
References
- https://github.com/Lightning-AI/pytorch-lightning/issues/21822
- https://github.com/Lightning-AI/pytorch-lightning/pull/21832
- https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86f
- https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameter
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