CVE-2026-58659: PyTorch Lightning Arbitrary Code Execution via _instantiator Hyperparameter
High · CVSS 7.8 (CVSS 3.1)EPSS 0.63%, 50th percentilePublished Updated Assigner: VulnCheck
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.
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H · CWE-470
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Lightning-AI: pytorch-lightning
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbc… (opens in new tab)
- github.com/Lightning-AI/pytorch-lightning/issues/21822 (opens in new tab)
- github.com/Lightning-AI/pytorch-lightning/pull/21832 (opens in new tab)
- www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiato… (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)