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CVE-2026-45804— Diffusers: TOCTOU Trust Remote Code Bypass

Quick assessment

Affected
huggingface diffusers
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

huggingface diffusers是huggingface的机器学习工具。 huggingface diffusers 0.38.0之前版本存在竞争条件问题漏洞，该漏洞源于DiffusionPipeline.from_pretrained流程可以绕过trust_remote_code防护，因为download()在验证model_index.json和自定义pipeline代码后，从可能变化的缓存文件夹加载，允许具有自定义.py pipeline代码的Hub仓库通过自定义pipeline流程执行，

CVSS 7.5 · High EPSS 0.37% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
huggingface diffusers < 0.38.0 affected
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I. Basic Information for CVE-2026-45804

Vulnerability Information
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Vulnerability Title
Diffusers: TOCTOU 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' DiffusionPipeline.from_pretrained flow can bypass the trust_remote_code guard because download() validates model_index.json and custom pipeline code before later loading from a cached folder that can change, allowing a Hub repository with custom .py pipeline code to execute through the custom pipeline flow without passing custom_pipeline or trust_remote_code=True. This issue is fixed in version 0.38.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
huggingface diffusers 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
huggingface diffusers是huggingface的机器学习工具。 huggingface diffusers 0.38.0之前版本存在竞争条件问题漏洞，该漏洞源于DiffusionPipeline.from_pretrained流程可以绕过trust_remote_code防护，因为download()在验证model_index.json和自定义pipeline代码后，从可能变化的缓存文件夹加载，允许具有自定义.py pipeline代码的Hub仓库通过自定义pipeline流程执行，
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-2026-45804

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6937 chars
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III. Intelligence Information for CVE-2026-45804

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Patches & Fixes for CVE-2026-45804 (2)

Vendor Advisories for CVE-2026-45804 (1)

Other References for CVE-2026-45804 (1)

IV. Related Vulnerabilities

Same product: diffusers
Same vendor: huggingface
Same weakness: CWE-367

V. Comments for CVE-2026-45804

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