CVE-2026-58659

HighCVSS 7.8/10Last modified Oct 24, 2026

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.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-470

Affected software

Vendor	Product	Versions
Lightning-AI	pytorch-lightning	<= 2.6.5

References

https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86fPatch
https://github.com/Lightning-AI/pytorch-lightning/issues/21822Exploit, Issue Tracking, Mitigation
https://github.com/Lightning-AI/pytorch-lightning/pull/21832Issue Tracking, Patch
https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameterExploit, Patch, Third Party Advisory

Timeline

Published: Jul 15, 2026
Last modified: Oct 24, 2026
NVD status: Analyzed

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