---
id: CVE-2026-44513
title: Diffusers is the a library for  pretrained diffusion models
summary: >-
  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 omi…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-94
  - CWE-358
vendor: huggingface
product: diffusers
affected:
  - diffusers < 0.38.0
patched:
  - diffusers 0.38.0
published: '2026-05-14'
updated: '2026-08-28'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44513'
references:
  - url: >-
      https://github.com/huggingface/diffusers/security/advisories/GHSA-98h9-4798-4q5v
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60520'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-44513'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2477507'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44513.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44513'
  - url: 'https://github.com/huggingface/diffusers/issues/13446'
  - url: 'https://github.com/huggingface/diffusers/pull/13448'
  - url: >-
      https://github.com/huggingface/diffusers/commit/a37f6f8394ac2a7ee8360c3abea811efe54512b1
  - url: 'https://github.com/huggingface/diffusers'
  - url: 'https://github.com/huggingface/diffusers/releases/tag/v0.38.0'
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/diffusers/PYSEC-2026-40.yaml
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-44513'
  - url: 'https://access.redhat.com/errata/RHSA-2026:69466'
  - url: 'https://access.redhat.com/errata/RHSA-2026:69467'
  - url: 'https://access.redhat.com/errata/RHSA-2026:70965'
  - url: 'https://access.redhat.com/errata/RHSA-2026:70979'
tags:
  - nvd
  - osv
  - pip
  - csaf
  - vex
  - red-hat
epss: 0.0089
epssPercentile: 0.57611
ingestedAt: '2026-08-29T00:27:52.829Z'
aliases:
  - GHSA-98h9-4798-4q5v
  - PYSEC-2026-40
ecosystem: pip
---

## Overview

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.

## Affected

- `diffusers < 0.38.0`

## Remediation

Upgrade past the affected range:

- `diffusers 0.38.0`

## Package advisory (CVE-2026-44513)

Affected packages:

- `diffusers < 0.38.0`

Patched in:

- `diffusers 0.38.0`

Source: https://osv.dev/vulnerability/GHSA-98h9-4798-4q5v

## Vendor advisories

- **RHSA-2026:69466** · Red Hat · fixed in: Red Hat AI Inference Server 3.4 · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69466)
- **RHSA-2026:69467** · Red Hat · fixed in: Red Hat AI Inference Server 3.4 · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69467)
- **RHSA-2026:60520** · Red Hat · fixed in: Red Hat OpenShift AI 3.4 · released 2026-08-27 · [advisory](https://access.redhat.com/errata/RHSA-2026:60520)
- **Red Hat VEX** · Important · affected: Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · no fix planned: Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44513.json)
- **RHSA-2026:70965** · Red Hat · fixed in: Red Hat AI Inference Server 3.4 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70965)
- **RHSA-2026:70979** · Red Hat · fixed in: Red Hat AI Inference Server 3.4 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70979)