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 we

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.

CVSS 3.1

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

Severity from

NVD

Also known as

CVE-2026-58659, GHSA-qqmf-gpg7-g8gw, PYSEC-2026-3624

• github.com/Lightning-AI/pytorch-lightning/issues/21822
• github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86f
• github.com/Lightning-AI/pytorch-lightning/pull/21832
• www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameter
• github.com/Lightning-AI/pytorch-lightning/releases/tag/2.6.6
• github.com/advisories/GHSA-qqmf-gpg7-g8gw