CRITICAL9.1

PYSEC-2026-3970

PyTorch Lightning path traversal vulnerability

Quick fix

PYSEC-2026-3970 — lightning: upgrade to the fixed version with the command below.

pip install --upgrade 'lightning>=2.4.0'

Details

In lightning-ai/pytorch-lightning version 2.3.2, a vulnerability exists in the `LightningApp` when running on a Windows host. The vulnerability occurs at the `/api/v1/upload_file/` endpoint, allowing an attacker to write or overwrite arbitrary files by providing a crafted filename. This can lead to potential remote code execution (RCE) by overwriting critical files or placing malicious files in sensitive locations.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/lightning

Introduced in: 0Fixed in: 2.4.0

Fixpip install --upgrade 'lightning>=2.4.0'

References

https://nvd.nist.gov/vuln/detail/CVE-2024-8019[ADVISORY]
https://github.com/lightning-ai/pytorch-lightning/commit/330af381de88cff17515418a341cbc1f9f127f9a[WEB]
https://github.com/pytorch/pytorch[PACKAGE]
https://huntr.com/bounties/2754298b-5af5-48ef-8b38-999093ddf2bd[WEB]
https://pypi.org/project/pytorch-lightning[PACKAGE]
https://github.com/advisories/GHSA-4cv3-v7pv-rfhf[ADVISORY]