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Vulnerability record · CVE-2026-34445 · published 1 April 2026

CVE-2026-34445: Linuxfoundation onnx improper input validation vulnerability

Linuxfoundation · Onnx

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, the ExternalDataInfo class in ONNX was using Python’s setattr() function to load metadata (like file paths or data lengths) directly from an ONNX model file. It didn’t check if the "keys" in the file were valid. Due to this, an attacker could craft a malicious model that overwrites internal object properties. This issue has been patched in version 1.21.0.

8.6 CVSS 3.1 High EPSS 0.51% · top 59.2% CWE-20 · Improper input validationCWE-400 · Uncontrolled resource consumption
8.6CVSS 3.1 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, the ExternalDataInfo class in ONNX was using Python’s setattr() function to load metadata (like file paths or data lengths) directly from an ONNX model file. It didn’t check if the "keys" in the file were valid. Due to this, an attacker could craft a malicious model that overwrites internal object properties. This issue has been patched in version 1.21.0.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/onnx/onnx/commit/e30c6935d67cc3eca2fa284e37248e7c0036c46b Patch
https://github.com/onnx/onnx/pull/7751 Issue TrackingPatch
https://github.com/onnx/onnx/security/advisories/GHSA-538c-55jv-c5g9 PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.1CVE-2026-28500Linuxfoundation onnx insufficient verification of data authenticity vulnerabilityOpen Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. In versions up to and including 1.20.1, a security con…EPSS 0.31%9.1CVE-2024-27319Linuxfoundation onnx out-of-bounds read vulnerabilityVersions of the package onnx before and including 1.15.0 are vulnerable to Out-of-bounds Read as the ONNX_ASSERT and ONNX_ASSERTM functions have an o…EPSS 0.59%8.8CVE-2025-51480Linuxfoundation onnx path traversal vulnerabilityPath Traversal vulnerability in onnx.external_data_helper.save_external_data in ONNX 1.17.0 allows attackers to overwrite arbitrary files by supplyin…EPSS 0.60%8.8CVE-2024-5187Linuxfoundation onnx path traversal vulnerabilityA vulnerability in the `download_model_with_test_data` function of the onnx/onnx framework, version 1.16.0, allows for arbitrary file overwrite due t…EPSS 1.2%8.7CVE-2026-27489Linuxfoundation onnx relative path traversal vulnerabilityOpen Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, a path traversal vulnerabilit…EPSS 0.62%7.5CVE-2024-27318Linuxfoundation onnx path traversal vulnerabilityVersions of the package onnx before and including 1.15.0 are vulnerable to Directory Traversal as the external_data field of the tensor proto can hav…EPSS 1.2%7.5CVE-2022-25882Linuxfoundation onnx path traversal vulnerabilityVersions of the package onnx before 1.13.0 are vulnerable to Directory Traversal as the external_data field of the tensor proto can have a path to th…EPSS 1.6%6.8CVE-2026-49114Linuxfoundation onnx path traversal vulnerabilityIn ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's external_data location field and opens i…EPSS 0.16%

Source: NIST National Vulnerability Database (record CVE-2026-34445), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.