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

Quick assessment

Affected
huggingface diffusers
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

diffusers是Hugging Face开源的一个生成图像、音频和3D分子结构的扩散模型库。 Diffusers 0.38.0之前版本存在代码注入漏洞，该漏洞源于custom_pipeline参数处理不当，可能导致远程代码执行。

CVSS 8.8 · High EPSS 0.56% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
huggingface diffusers < 0.38.0 affected
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I. Basic Information for CVE-2026-44827

Vulnerability Information
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Vulnerability Title
Diffusers: None.py Trust Remote Code Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
diffusers 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
diffusers是Hugging Face开源的一个生成图像、音频和3D分子结构的扩散模型库。 Diffusers 0.38.0之前版本存在代码注入漏洞，该漏洞源于custom_pipeline参数处理不当，可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
huggingface diffusers < 0.38.0 -

II. Public POCs for CVE-2026-44827

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III. Intelligence Information for CVE-2026-44827

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Vendor Advisories for CVE-2026-44827 (1)

IV. Related Vulnerabilities

Same product: diffusers
Same vendor: huggingface
Same weakness: CWE-94

V. Comments for CVE-2026-44827

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