CVE-2026-28500Network attack vector

Untrusted model loading via suppressed repository warnings

Published Mar 18, 2026 · Updated Mar 18, 2026

Trust-check bypass in ONNX 1.20.1 and earlier allows remote attackers to load unverified models through onnx.hub.load(). When silent=True, the function disregards a failed repository check by suppressing its warning and confirmation path, while trusting a hash from the same repository manifest. Exploitation requires a pipeline to use silent=True with an external repository string; malicious model code then receives the pipeline's host access.

CVSS severity4.8
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Trust-check bypass in ONNX 1.20.1 and earlier allows remote attackers to load unverified models through onnx.hub.load(). When silent=True, the function disregards a failed repository check by suppressing its warning and confirmation path, while trusting a hash from the same repository manifest. Exploitation requires a pipeline to use silent=True with an external repository string; malicious model code then receives the pipeline's host access.

The record

CVE
CVE-2026-28500
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
ONNX
Product
ONNX
Classifications
CWE-345, CWE-693, CWE-494, T1105
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 1.20.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ONNX · ONNXversion=<= 1.20.1

Published CVSS scores

4.8GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
8.6Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-693Protection Mechanism Failure
CWE-494Download of Code Without Integrity Check
T1105Ingress Tool Transfer

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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