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Vulnerability record · CVE-2026-34446 · published 1 April 2026

CVE-2026-34446: Linuxfoundation onnx path traversal vulnerability

Linuxfoundation · Onnx

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, there is an issue in onnx.load, the code checks for symlinks to prevent path traversal, but completely misses hardlinks because a hardlink looks exactly like a regular file on the filesystem. This issue has been patched in version 1.21.0.

5.5 CVSS 3.1 Medium EPSS 0.17% · top 94.3% CWE-22 · Path traversalCWE-61 · CWE-61
5.5CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
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, there is an issue in onnx.load, the code checks for symlinks to prevent path traversal, but completely misses hardlinks because a hardlink looks exactly like a regular file on the filesystem. This issue has been patched in version 1.21.0.

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

Affected products

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

References

LinkTags
https://github.com/onnx/onnx/commit/4755f8053928dce18a61db8fec71b69c74f786cb Patch
https://github.com/onnx/onnx/security/advisories/GHSA-cmw6-hcpp-c6jp Vendor 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%8.6CVE-2026-34445Linuxfoundation onnx improper input validation vulnerabilityOpen Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, the ExternalDataInfo class in…EPSS 0.51%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%

Source: NIST National Vulnerability Database (record CVE-2026-34446), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.