CVE-2026-28500
ONNX hub.load() trust bypass enables silent model-based exfiltration.
Is CVE-2026-28500 being exploited?
Not confirmed. CVE-2026-28500 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.32% probability of exploitation in the next 30 days.
How severe is CVE-2026-28500?
CVE-2026-28500 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-28500?
Yes. A fix has been recorded for CVE-2026-28500. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-28500 affect?
CVE-2026-28500 affects ONNX, onnx.hub.load(), ONNX Runtime <=1.20.1. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-28500?
Disable silent loading; enforce trusted sources; monitor model loads for anomalies.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Exfiltration of SSH keys and cloud credentials via non-official models during load.
Monitor only
- affected<= 1.20.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.