PYSEC-2026-40

See a problem?
Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/diffusers/PYSEC-2026-40.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-40
Aliases
Published
2026-05-14T17:16:22.903Z
Modified
2026-05-20T09:18:56.669156Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

Diffusers is the a library for pretrained diffusion models. Prior to 0.38.0, a trustremotecode bypass in DiffusionPipeline.frompretrained allows arbitrary remote code execution despite the user passing trustremotecode=False (or omitting it, which is the default). The vulnerability has three variants, all sharing the same root cause — the trustremotecode gate was implemented inside DiffusionPipeline.download() rather than at the actual dynamic-module load site, so any code path that bypassed or short-circuited download() also bypassed the security check. DiffusionPipeline.frompretrained('repoA', custompipeline='attacker/repoB', trustremotecode=False) — the gate evaluated against repoA's file list rather than repoB's, so repoB's pipeline.py was loaded and executed. DiffusionPipeline.frompretrained('/local/snapshot', custompipeline='attacker/repoB', trustremotecode=False) — the local-path branch never invoked download(), so the gate was never reached and remote code from repoB executed. DiffusionPipeline.frompretrained('/local/snapshot', trustremotecode=False) where the snapshot contains custom component files (e.g. unet/myunetmodel.py) referenced from model_index.json — same root cause; the local path skipped download() and custom component code executed. This vulnerability is fixed in 0.38.0.

References

Affected packages

PyPI / diffusers

Package

Name
diffusers
View open source insights on deps.dev
Purl
pkg:pypi/diffusers

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.38.0

Affected versions

0.*
0.0.1
0.0.2
0.0.3
0.0.4
0.1.0
0.1.1
0.1.2
0.1.3
0.2.0
0.2.1
0.2.2
0.2.3
0.2.4
0.3.0
0.4.0
0.4.1
0.4.2
0.5.0
0.5.1
0.6.0
0.7.0
0.7.1
0.7.2
0.8.0
0.8.1
0.9.0
0.10.0
0.10.1
0.10.2
0.11.0
0.11.1
0.12.0
0.12.1
0.13.0
0.13.1
0.14.0
0.15.0
0.15.1
0.16.0
0.16.1
0.17.0
0.17.1
0.18.0
0.18.1
0.18.2
0.19.0
0.19.1
0.19.2
0.19.3
0.20.0
0.20.1
0.20.2
0.21.0
0.21.1
0.21.2
0.21.3
0.21.4
0.22.0
0.22.1
0.22.2
0.22.3
0.23.0
0.23.1
0.24.0
0.25.0
0.25.1
0.26.0
0.26.1
0.26.2
0.26.3
0.27.0
0.27.1
0.27.2
0.28.0
0.28.1
0.28.2
0.29.0
0.29.1
0.29.2
0.30.0
0.30.1
0.30.2
0.30.3
0.31.0
0.32.0
0.32.1
0.32.2
0.33.0
0.33.1
0.34.0
0.35.0
0.35.1
0.35.2
0.36.0
0.37.0
0.37.1

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/diffusers/PYSEC-2026-40.yaml"