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

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-34446
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-01 18:16:30 UTC
Updated2026-04-01 18:16:30 UTC
DescriptionOpen 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.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

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

Problem Types: CWE-22 | CWE-61 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | CWE-61 CWE-61: UNIX Symbolic Link (Symlink) Following

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
3.1CNADECLARED4.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Onnx Onnx affected < 1.21.0 Not specified

References

ReferenceSourceLinkTags
github.com/onnx/onnx/security/advisories/GHSA-cmw6-hcpp-c6jp [email protected] github.com
github.com/onnx/onnx/commit/4755f8053928dce18a61db8fec71b69c74f786cb [email protected] github.com
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