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.
History

Fri, 03 Apr 2026 01:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-41
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 02 Apr 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Onnx
Onnx onnx
Vendors & Products Onnx
Onnx onnx

Thu, 02 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 01 Apr 2026 23:45:00 +0000

Type Values Removed Values Added
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.
Title ONNX: Arbitrary File Read via ExternalData Hardlink Bypass in ONNX load
Weaknesses CWE-22
CWE-61
References
Metrics cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-04-01T17:37:54.737Z

Updated: 2026-04-02T14:10:36.637Z

Reserved: 2026-03-27T18:18:14.894Z

Link: CVE-2026-34446

cve-icon Vulnrichment

Updated: 2026-04-02T14:10:33.155Z

cve-icon NVD

Status : Received

Published: 2026-04-01T18:16:30.660

Modified: 2026-04-01T18:16:30.660

Link: CVE-2026-34446

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-04-01T17:37:54Z

Links: CVE-2026-34446 - Bugzilla