Riskcovery

CVE-2026-34446

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

State
Published
Severity
4.7 Medium
Published
Apr 1, 2026
Updated
Apr 2, 2026
Reserved
Mar 27, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.14.7 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:NGitHub_M

Weaknesses

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

Affected Products

ProductVersions
onnxonnx
  • < 1.21.0Affected

References

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