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CVE-2026-28500: ONNX Untrusted Model Repository Warnings Suppressed by silent=True in onnx.hub.load() — Silent Supply-Chain Attack

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-18 · updated 2026-07-15
• Weakness: CWE-345

Description

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.

Affected products

• onnx: through 1.20.1

References

• https://github.com/ZeroXJacks/CVEs/blob/main/2026/CVE-2026-28500.md
• https://github.com/onnx/onnx/security/advisories/GHSA-hqmj-h5c6-369m
• https://access.redhat.com/errata/RHSA-2026:24977
• https://access.redhat.com/security/cve/CVE-2026-28500
• https://bugzilla.redhat.com/show_bug.cgi?id=2448518
• https://github.com/ZeroXJacks/CVEs/blob/main/2026/CVE-2026-28500.md
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28500.json

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