PYSEC-2026-3974

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Import Source

https://github.com/pypa/advisory-database/blob/main/vulns/pytorch-lightning/PYSEC-2026-3974.yaml

JSON Data

https://api.osv.dev/v1/vulns/PYSEC-2026-3974

Aliases

Published

2026-09-10T16:42:38Z

Modified

2026-09-10T17:25:53Z

Severity

9.8 (Critical) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator

Summary

Remote code execution in pytorch lightning

Details

A remote code execution (RCE) vulnerability exists in the lightning-ai/pytorch-lightning library version 2.2.1 due to improper handling of deserialized user input and mismanagement of dunder attributes by the deepdiff library. The library uses deepdiff.Delta objects to modify application state based on frontend actions. However, it is possible to bypass the intended restrictions on modifying dunder attributes, allowing an attacker to construct a serialized delta that passes the deserializer whitelist and contains dunder attributes. When processed, this can be exploited to access other modules, classes, and instances, leading to arbitrary attribute write and total RCE on any self-hosted pytorch-lightning application in its default configuration, as the delta endpoint is enabled by default.

References

Affected packages

PyPI / pytorch-lightning

Package

Name: pytorch-lightning; View open source insights on deps.dev
Purl: pkg:pypi/pytorch-lightning

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.3.3

Affected versions

0.*

0.0.2

0.2

0.2.2

0.2.3

0.2.4

0.2.4.1

0.2.5

0.2.5.1

0.2.5.2

0.2.6

0.3

0.3.1

0.3.2

0.3.3

0.3.4

0.3.4.1

0.3.5

0.3.6

0.3.6.1

0.3.6.3

0.3.6.4

0.3.6.5

0.3.6.6

0.3.6.7

0.3.6.8

0.3.6.9

0.4.0

0.4.1

0.4.2

0.4.3

0.4.4

0.4.5

0.4.6

0.4.7

0.4.8

0.4.9

0.5.0

0.5.1

0.5.1.2

0.5.1.3

0.5.2

0.5.2.1

0.5.3

0.5.3.1

0.5.3.2

0.5.3.3

0.6.0

0.7.1

0.7.3

0.7.5

0.7.6

0.8.1

0.8.3

0.8.4

0.8.5

0.9.0

0.10.0

1.*

1.0.0

1.0.1

1.0.2

1.0.3

1.0.4

1.0.5

1.0.6

1.0.7

1.0.8

1.1.0

1.1.1

1.1.2

1.1.3

1.1.4

1.1.5

1.1.6

1.1.7

1.1.8

1.2.0rc0

1.2.0rc1

1.2.0rc2

1.2.0

1.2.1

1.2.2

1.2.3

1.2.4

1.2.5

1.2.6

1.2.7

1.2.8

1.2.9

1.2.10

1.3.0rc1

1.3.0rc2

1.3.0rc3

1.3.0

1.3.1

1.3.2

1.3.3

1.3.4

1.3.5

1.3.6

1.3.7

1.3.7.post0

1.3.8

1.4.0rc0

1.4.0rc1

1.4.0rc2

1.4.0

1.4.1

1.4.2

1.4.3

1.4.4

1.4.5

1.4.6

1.4.7

1.4.8

1.4.9

1.5.0rc0

1.5.0rc1

1.5.0

1.5.1

1.5.2

1.5.3

1.5.4

1.5.5

1.5.6

1.5.7

1.5.8

1.5.9

1.5.10

1.5.10.post0

1.6.0rc0

1.6.0rc1

1.6.0

1.6.1

1.6.2

1.6.3

1.6.4

1.6.5

1.6.5.post0

1.7.0rc0

1.7.0rc1

1.7.0

1.7.1

1.7.2

1.7.3

1.7.4

1.7.5

1.7.6

1.7.7

1.8.0rc0

1.8.0rc1

1.8.0rc2

1.8.0

1.8.0.post1

1.8.1

1.8.2

1.8.3

1.8.3.post0

1.8.3.post1

1.8.3.post2

1.8.4

1.8.4.post0

1.8.5

1.8.5.post0

1.8.6

1.9.0rc0

1.9.0

1.9.1

1.9.2

1.9.3

1.9.4

1.9.5

2.*

2.0.0rc0

2.0.0

2.0.1

2.0.1.post0

2.0.2

2.0.3

2.0.4

2.0.5

2.0.6

2.0.7

2.0.8

2.0.9

2.0.9.post0

2.1.0rc0

2.1.0rc1

2.1.0

2.1.1

2.1.2

2.1.3

2.1.4

2.2.0rc0

2.2.0

2.2.0.post0

2.2.1

2.2.2

2.2.3

2.2.4

2.2.5

2.3.0.dev20240318

2.3.0.dev20240324

2.3.0.dev20240328

2.3.0.dev20240331

2.3.0.dev20240407

2.3.0.dev20240414

2.3.0.dev20240421

2.3.0.dev20240428

2.3.0.dev20240505

2.3.0.dev20240519

2.3.0.dev20240526

2.3.0.dev20240602

2.3.0.dev20240609

2.3.0.dev20240616

2.3.0.dev20240623

2.3.0

2.3.1

2.3.2

Database specific

source

"https://github.com/pypa/advisory-database/blob/main/vulns/pytorch-lightning/PYSEC-2026-3974.yaml"