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CVE-2026-44513— Diffusers: `trust_remote_code` bypass via `custom_pipeline` and local custom components

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trust_remote_code绕过问题，可能导致任意远程代码执行。

CVSS 8.8 · High EPSS 0.89% · P58

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
huggingface diffusers < 0.38.0 affected
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I. Basic Information for CVE-2026-44513

Vulnerability Information
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Vulnerability Title
Diffusers: `trust_remote_code` bypass via `custom_pipeline` and local custom components
Source: CVE Program / CVE List V5
Vulnerability Description
Diffusers is the a library for pretrained diffusion models. Prior to 0.38.0, a trust_remote_code bypass in DiffusionPipeline.from_pretrained allows arbitrary remote code execution despite the user passing trust_remote_code=False (or omitting it, which is the default). The vulnerability has three variants, all sharing the same root cause — the trust_remote_code 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.from_pretrained('repoA', custom_pipeline='attacker/repoB', trust_remote_code=False) — the gate evaluated against repoA's file list rather than repoB's, so repoB's pipeline.py was loaded and executed. DiffusionPipeline.from_pretrained('/local/snapshot', custom_pipeline='attacker/repoB', trust_remote_code=False) — the local-path branch never invoked download(), so the gate was never reached and remote code from repoB executed. DiffusionPipeline.from_pretrained('/local/snapshot', trust_remote_code=False) where the snapshot contains custom component files (e.g. unet/my_unet_model.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.
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trust_remote_code绕过问题，可能导致任意远程代码执行。
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-2026-44513

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III. Intelligence Information for CVE-2026-44513

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Vendor Advisories for CVE-2026-44513 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-44513

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