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CVE-2026-34446

ONNX: Arbitrary File Read via ExternalData Hardlink Bypass in ONNX load

Published: Apr 1, 2026Updated: Apr 15, 2026 Sources: CVE List NVDCWE-22
NVD MITRE
4.7CVSSMEDIUM
EPSS Score
0.2%
Top 92.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:LAC:HPR:NUI:RS:UC:HI:NA:N
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-22CWE-61

Affected Products

onnxlinuxfoundation
Mixed
AI / ML / ml-framework
onnxonnx
Library
AI / ML / ml-framework
linuxfoundationoss-projectUSAI / MLaka yocto, pytorch, everest
onnxoss-projectAI / MLaka onnx-mlir

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://github.com/onnx/onnx/commit/4755f8053928dce18a61db8fec71b69c74f786cb
github.com
https://github.com/onnx/onnx/security/advisories/GHSA-cmw6-hcpp-c6jp
github.com

Timeline

Published
Apr 1, 2026
Last Updated
Apr 15, 2026

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