CVE-2026-45804Public exploitNetwork attack vector

Remote code execution via mutable Hub snapshot

Published Jul 15, 2026 · Updated Jul 15, 2026

TOCTOU race in Hugging Face Diffusers before 0.38.0 allows remote attackers to execute code via a changing Hub repository. DiffusionPipeline.from_pretrained checks model_index.json with hf_hub_download, then snapshot_download can resolve a newer commit whose custom pipeline is imported without another trust check. Exploitation requires a first or forced Hub download without a pinned commit and the victim's pipeline-loading action; successful code runs with the victim process's privileges.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TOCTOU race in Hugging Face Diffusers before 0.38.0 allows remote attackers to execute code via a changing Hub repository. DiffusionPipeline.from_pretrained checks model_index.json with hf_hub_download, then snapshot_download can resolve a newer commit whose custom pipeline is imported without another trust check. Exploitation requires a first or forced Hub download without a pinned commit and the victim's pipeline-loading action; successful code runs with the victim process's privileges.

The record

CVE
CVE-2026-45804
Published
Jul 15, 2026
Updated
Jul 15, 2026
Vendor
Hugging Face
Product
Diffusers
Classifications
CWE-367, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.38.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hugging Face · Diffusersversion=< 0.38.0

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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