Description
PyTorch-Lightning versions 2.6.0 and earlier contain an insecure deserialization vulnerability (CWE-502) in the checkpoint loading mechanism. The LightningModule.load_from_checkpoint() method, which is commonly used to load saved model states, internally calls torch.load() without setting the security-restrictive weights_only=True parameter. This default behavior allows the deserialization of arbitrary Python objects via the Pickle module. A remote attacker can exploit this by providing a maliciously crafted checkpoint file, leading to arbitrary code execution on the victim's system when the file is loaded.
Published: 2026-05-12
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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History

Fri, 15 May 2026 19:45:00 +0000

Type Values Removed Values Added
Title Insecure Deserialization in PyTorch-Lightning Leads to Remote Code Execution

Fri, 15 May 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}


Thu, 14 May 2026 21:30:00 +0000

Type Values Removed Values Added
Title Insecure Deserialization in PyTorch-Lightning Allows Arbitrary Code Execution

Thu, 14 May 2026 19:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-502
CPEs cpe:2.3:a:lightningai:pytorch_lightning:*:*:*:*:*:python:*:*
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}


Tue, 12 May 2026 19:30:00 +0000

Type Values Removed Values Added
First Time appeared Lightningai
Lightningai pytorch Lightning
Vendors & Products Lightningai
Lightningai pytorch Lightning

Tue, 12 May 2026 17:45:00 +0000

Type Values Removed Values Added
Title Insecure Deserialization in PyTorch-Lightning Allows Arbitrary Code Execution

Tue, 12 May 2026 16:00:00 +0000

Type Values Removed Values Added
Description PyTorch-Lightning versions 2.6.0 and earlier contain an insecure deserialization vulnerability (CWE-502) in the checkpoint loading mechanism. The LightningModule.load_from_checkpoint() method, which is commonly used to load saved model states, internally calls torch.load() without setting the security-restrictive weights_only=True parameter. This default behavior allows the deserialization of arbitrary Python objects via the Pickle module. A remote attacker can exploit this by providing a maliciously crafted checkpoint file, leading to arbitrary code execution on the victim's system when the file is loaded.
References

Subscriptions

Lightningai Pytorch Lightning
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-05-15T18:05:39.679Z

Reserved: 2026-03-09T00:00:00.000Z

Link: CVE-2026-31221

cve-icon Vulnrichment

Updated: 2026-05-15T18:02:42.483Z

cve-icon NVD

Status : Modified

Published: 2026-05-12T16:16:14.020

Modified: 2026-05-15T19:16:57.333

Link: CVE-2026-31221

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-15T19:30:05Z

Weaknesses