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TI-2026-23883 Aliases CVE-2026-31221GHSA-75m9-98v2-hjpm

PyTorch-Lightning versions 2.6.0 and earlier contain an insecure deserialization…

Priority MEDIUM 40CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00385 32nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
—pytorch-lightning (PyPI)up to 2.6.0—No fix listedGHSA-75m9-98v2-hjpm
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • pytorch-lightning (PyPI) Vendor— Affected up to 2.6.0 Fixed in — No fix listed GHSA-75m9-98v2-hjpm

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:lightningai:pytorch_lightning:*:*:*:*:*:python:*:*up to 2.6.0Vulnerablelightning-ai
  • cpe:2.3:a:lightningai:pytorch_lightning:*:*:*:*:*:python:*:* Versions up to 2.6.0 Vulnerable ·lightning-ai

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat AI Inference ServerAffectedNo fix yet
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet
Red Hat OpenShift AI (RHOAI)AffectedNo fix planned: Will not fix

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-31221
  2. 2026-10-03 Alias added: GHSA-75m9-98v2-hjpm

References

Exploit 1

Advisory 1

Other 1

  • TI-2024-05067 RCE via Property/Class Pollution in lightning-ai/pytorch-lightning CVSS 3.1CRITICAL 9.8
  • TI-2024-05541 Arbitrary File Write via /v1/runs API endpoint in lightning-ai/pytorch-lightning CVSS 3.1CRITICAL 9.8
  • TI-2024-07433 Arbitrary File Write/Overwrite in lightning-ai/pytorch-lightning CVSS 3.1CRITICAL 9.1
  • TI-2026-42224 PyTorch Lightning Arbitrary Code Execution via _instantiator Hyperparameter CVSS 4.0HIGH 8.4
  • TI-2024-07434 Denial of Service in lightning-ai/pytorch-lightning CVSS 3.0HIGH 7.5
  • TI-2026-32421 Compromise of PyTorch Lightning PyPi Package Versions CVSS 4.0CRITICAL 9.3
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences