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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-44513)

ID	Name	Product	Family	Type	Severity
441461	SCA: security update for diffusers (GHSA-98h9-4798-4q5v)	Tenable Cloud Security	SCA Checks	Local	high
441461	SCA: security update for diffusers (GHSA-98h9-4798-4q5v)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-44513

high

Tenable Plugins

high

high