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CVE-2026-45804 high CVSS 7.5

Vulnerability in diffusers (CVE-2026-45804)

Summary

Vulnerability in diffusers (CVE-2026-45804). Successful exploitation can lead to full system takeover. Exploitable via diffusers. Mitigation: upgrade to 0.38.0 or later.

Original description

The description as published by the source.

Background

This vulnerability is found in the diffusers package - the transformers-equivalent library for diffusion models.

It is found in the DiffusionPipeline.from_pretrained flow, which is used to load a pipeline from the HuggingFace Hub.

This function has a trust_remote_code guard: if the repository’s model_index.json references a custom pipeline class defined in a .py file in the repo, the load is blocked unless trust_remote_code=True is explicitly passed:

ValueError: The repository for attacker/repo contains custom code in pipeline.py
which must be executed to correctly load the model. You can inspect the repository
content at https://hf.co/attacker/repo/blob/main/pipeline.py.
Please pass the argument `trust_remote_code=True` to allow custom code to be run.

The vulnerability allows arbitrary code execution through the custom pipeline flow from a Hub repo, with no custom_pipeline or trust_remote_code kwargs passed. The from_pretrained call succeeds and returns a functional pipeline.

Naive Flow

DiffusionPipeline.from_pretrained begins by popping all relevant arguments from kwargs into local variables, then calls DiffusionPipeline.download() to fetch the repo files:

# pipeline_utils.py:853
cached_folder = cls.download(
    pretrained_model_name_or_path,
    ...
    custom_pipeline=custom_pipeline,
    trust_remote_code=trust_remote_code,
    ...
)

Inside download(), model_index.json is fetched first as…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-45804 has been found in diffusers.
Attackers can target a specific entry point like diffusers over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 7.5/10.
What to do: upgrade diffusers to 0.38.0 or later.
If unsure, ask your IT team or search "diffusers CVE-2026-45804" on the vendor's site.

CVE-2026-45804 (diffusers) — CWE-367 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: diffusers / transformers / DiffusionPipeline.from_pretrained / trust_remote_code
Patched: 0.38.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-367) exists in diffusers. Attackers reach the vulnerable code path via diffusers without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of diffusers. Attack surface: diffusers / transformers / DiffusionPipeline.from_pretrained / trust_remote_code.

🔥 Severity

Severity: High (CVSS 7.5/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 0.38.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'diffusers' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'diffusers' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で diffusers を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade diffusers to 0.38.0

    ステージング環境で 0.38.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

pip diffusers
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.38.0"}]}]
PyPI diffusers
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.38.0"}]}]

References

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