Is this vulnerability remotely exploitable?

It can be, if a system exposes a remote interface that accepts ONNX models (for example, an upload API, a model registry, or a multi-tenant inference platform). In such cases, a remote attacker could submit a malicious model that the backend then parses with a vulnerable ONNX version.

What access does an attacker need to exploit this issue?

The attacker must be able to supply or influence an ONNX model file that will be loaded by the affected code. This could involve direct file uploads, pushing models into a shared repository, or compromising a pipeline that produces or transforms models.

What is the safest general fix pattern?

The safest approach is to never trust metadata keys from model files blindly: enforce a strict allowlist of known keys, explicitly assign them to typed fields, and ignore or reject anything unexpected. Removing generic `setattr()` calls that operate on untrusted key names is central to the fix.

Severity:

HIGH RISK

(8.6)

Improper Input Validation in ExternalDataInfo Metadata Handling (CWE-20) in ONNX

CVE-2026-34445

Published:

Apr 1, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Vulnerability Type

Category:

Improper Input Validation

CWE:

CWE-20;CWE-400;CWE-915

Impact:

Integrity and Control-Flow Manipulation via Malicious Model Files

Severity:

HIGH RISK

(8.6)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Input Validation

CWE:

CWE-20;CWE-400;CWE-915

Impact:

Integrity and Control-Flow Manipulation via Malicious Model Files

Severity:

HIGH RISK

(8.6)

CVSS Version:

3.1

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Improper Input Validation in ExternalDataInfo Metadata Handling (CWE-20) in ONNX

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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