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

> Attackers can execute arbitrary code by exploiting a race condition in Diffusers' model loading, bypassing remote code trust checks.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 15 Jul 2026
- **Updated:** 15 Jul 2026
- **Also known as:** GHSA-7wx4-6vff-v64p, PYSEC-2026-2446

## What is CVE-2026-45804?

CVE-2026-45804 is a high-severity vulnerability in huggingface diffusers, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition)

## Which versions are affected by CVE-2026-45804?

3 open source packages ship an affected version, including diffusers. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `diffusers` | PyPI | All versions | 0.38.0 |
| `diffusers` | PyPI | All versions | 0.38.0 |
| `diffusers` | PyPI | All versions | 0.38.0 |

Products: Huggingface Diffusers.

## How do I fix CVE-2026-45804?

Upgrade diffusers to 0.38.0 or later.

## Is CVE-2026-45804 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45804 exists.

## Other vulnerabilities in huggingface diffusers

- [CVE-2026-44513](https://insights.sbomify.com/CVE-2026-44513/): Diffusers: `trust_remote_code` bypass via `custom_pipeline` and local custom components (high 8.8)
- [CVE-2026-44827](https://insights.sbomify.com/CVE-2026-44827/): Diffusers: None.py Trust Remote Code Bypass (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-45804 and fix it if it is affected.

What it is: CVE-2026-45804 is a high-severity vulnerability in huggingface diffusers, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45804 exists.

Affected packages and fixed versions:
- diffusers (PyPI): affected all versions; fixed in 0.38.0
- diffusers (PyPI): affected all versions; fixed in 0.38.0
- diffusers (PyPI): affected all versions; fixed in 0.38.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-45804/ (Markdown: https://insights.sbomify.com/CVE-2026-45804/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45804
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45804
- OSV: https://osv.dev/vulnerability/CVE-2026-45804

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45804/
Summaries are generated and may contain mistakes; the official description above is the record.