Vulnerability · Published Mar 18, 2026 · Assigned by GitHub_M
CVE-2026-28500ONNX Untrusted Model Repository Warnings Suppressed by silent=True in onnx.hub.load() — Silent Supply-Chain Attack
High 8.6
In plain English
A high-severity insufficient verification of data authenticity in onnx from onnx. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | onnx | no fix listed | DEBIAN-CVE-2026-28500 |
| Debian:13 | onnx | no fix listed | DEBIAN-CVE-2026-28500 |
| Debian:14 | onnx | no fix listed | DEBIAN-CVE-2026-28500 |
| PyPI | onnx | 1.21.0rc1 | GHSA-hqmj-h5c6-369m |
| PyPI | onnx | 1.21.0rc1 | PYSEC-2026-103 |
| Ubuntu:22.04:LTS | onnx | no fix listed | UBUNTU-CVE-2026-28500 |
| Ubuntu:25.10 | onnx | no fix listed | UBUNTU-CVE-2026-28500 |
| Ubuntu:26.04:LTS | onnx | no fix listed | UBUNTU-CVE-2026-28500 |
| Ubuntu:26.10 | onnx | no fix listed | UBUNTU-CVE-2026-28500 |
Affected products (as reported)
Weakness: CWE-345, CWE-494, CWE-693, CWE-829 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
References
- https://github.com/onnx/onnx/security/advisories/GHSA-hqmj-h5c6-369m x_refsource_CONFIRM
- https://github.com/ZeroXJacks/CVEs/blob/main/2026/CVE-2026-28500.md x_refsource_MISC
- https://access.redhat.com/security/cve/CVE-2026-28500 vdb-entry, x_refsource_REDHAT
- RHBZ#2448518 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28500.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:24977 vendor-advisory, x_refsource_REDHAT