CVE-2026-58659

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 v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86f	Patch
https://github.com/Lightning-AI/pytorch-lightning/issues/21822	Exploit Issue Tracking Mitigation
https://github.com/Lightning-AI/pytorch-lightning/pull/21832	Issue Tracking Patch
https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameter	Exploit Patch Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:lightningai:pytorch_lightning:*:*:*:*:*:python:*:*

History

No history.

Information

Published : 2026-07-15 18:16

Updated : 2026-08-06 17:31

NVD link : CVE-2026-58659

Mitre link : CVE-2026-58659

CVE.ORG link : CVE-2026-58659

JSON object : View

Products Affected

lightningai

pytorch_lightning

CWE

CWE-470

Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

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