CVE-2026-34446
ONNX: Arbitrary File Read via ExternalData Hardlink Bypass in ONNX load
CVSS Score
4.7
EPSS Score
0.0%
EPSS Percentile
1th
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.
| CWE | CWE-22 CWE-61 |
| Vendor | onnx |
| Product | onnx |
| Published | Apr 1, 2026 |
| Last Updated | Apr 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
onnx / onnx
< 1.21.0