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CVE-2026-44827

CVE-2026-44827 · Diffusers: None.py Trust Remote Code Bypass

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Diffusers is the a library for pretrained diffusion models. Prior to 0.38.0, diffusers 0.37.0 allows remote code execution without the trust_remote_code=True safeguard when loading pipelines from Hugging Face Hub repositories. The _resolve_custom_pipeline_and_cls function in pipeline_loading_utils.py performs string interpolation on the custom_pipeline parameter using f"{custom_pipeline}.py". When custom_pipeline is not supplied by the user, it defaults to None, which Python interpolates as the literal string "None.py". If an attacker publishes a Hub repository containing a file named None.py with a class that subclasses DiffusionPipeline, the file is automatically downloaded and executed during a standard DiffusionPipeline.from_pretrained() call with no additional keyword arguments. The trust_remote_code check in DiffusionPipeline.download() is bypassed because it evaluates custom_pipeline is not None as False (since the kwarg was never supplied), while the downstream code path that actually loads the module resolves the None value into a valid filename. An attacker can achieve silent arbitrary code execution by publishing a malicious model repository with a None.py file and a standard-looking model_index.json that references a legitimate pipeline class name, requiring only that a victim calls from_pretrained on the repository. This vulnerability is fixed in 0.38.0.

CVSS 8.8 · Élevée · EPSS 0,7% · Correctif disponible

Publication
Mise à jour

Pile logicielle: python

Produits et versions concernés

  • diffusers

    Versions du logiciel
    • < 0.38.0: Concernée

    Aucun correctif publié

  • diffusers PyPI

    Versions du logiciel
    • 0.0.1
    • 0.0.2
    • 0.0.3
    • 0.0.4
    • 0.1.0
    • 0.1.1
    • 0.1.2
    • 0.1.3
    • 0.10.0
    • 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
    • 0.2.0
    • 0.2.1
    • 0.2.2
    • 0.2.3
    • 0.2.4
    • 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
    • 0.3.0
    • 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
    • 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
    Plages de versions concernées
    • ECOSYSTEM: < 0.38.0

    Mettez à jour vers 0.38.0

Sources originales

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