Diffusers is the a library for pretrained diffusion models

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
• RHSA-2026:69467 · Red Hat · fixed in: Red Hat AI Inference Server 3.4 · released 2026-09-21 · advisory
• RHSA-2026:60520 · Red Hat · fixed in: Red Hat OpenShift AI 3.4 · released 2026-08-27 · advisory
• 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 2026-09-21 · vex