要点
- CVE-2026-28500 は onnx, onnx (linuxfoundation) に影響する深刻度「緊急」 (CVSS 9.1) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.32%（全脆弱性の 25.4% より高い）。
- 対処：1.21.0rc1 以降に更新してください。
| パッケージ | 影響を受けるバージョン | 修正済みバージョン |
|---|
| onnx PyPI | < 1.21.0rc1
| 1.21.0rc1
|
| onnx | ≤ 1.20.1
| 修正版なし |
概要
What's the issue
Passing silent=True to onnx.hub.load() kills all trust warnings and user prompts. This means a model can be downloaded from any unverified GitHub repo with zero user awareness.
if not _verify_repo_ref(repo) and not silent:
# completely skipped when silent=True
print("The model repo... is not trusted")
if input().lower() != "y":
return None
On top of that, the SHA256 integrity check is useless here — it validates against a manifest that lives in the same repo the attacker controls, so the hash will always match.
Impact
Any pipeline using hub.load() with silent=True and an external repo string is silently loading whatever the repo owner ships. If that model executes arbitrary code on load, the attacker has access to the machine.
Resolved by removing the feature
References
NVD の説明
Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. In versions up to and including 1.20.1, a security control bypass exists in onnx.hub.load() due to improper logic in the repository trust verification mechanism. While the function is designed to warn users when loading models from non-official sources, the use of the silent=True parameter completely suppresses all security warnings and confirmation prompts. This vulnerability transforms a standard model-loading function into a vector for Zero-Interaction Supply-Chain Attacks. When chained with file-system vulnerabilities, an attacker can silently exfiltrate sensitive files (SSH keys, cloud credentials) from the victim's machine the moment the model is loaded. As of time of publication, no known patched versions are available.
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