id: PYSEC-2026-2241
published: "2026-04-01T18:16:30.660Z"
modified: "2026-07-13T05:50:25.930745Z"
aliases:
- CVE-2026-34446
- GHSA-cmw6-hcpp-c6jp
details: 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.
affected:
- package:
    name: onnx
    ecosystem: PyPI
    purl: pkg:pypi/onnx
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 1.21.0
  versions:
  - "0.1"
  - "0.2"
  - 0.2.1
  - 1.0.0
  - 1.0.1
  - 1.1.0
  - 1.1.1
  - 1.1.2
  - 1.10.0
  - 1.10.1
  - 1.10.2
  - 1.11.0
  - 1.12.0
  - 1.13.0
  - 1.13.1
  - 1.14.0
  - 1.14.1
  - 1.15.0
  - 1.16.0
  - 1.16.1
  - 1.16.2
  - 1.17.0
  - 1.18.0
  - 1.19.0
  - 1.19.1
  - 1.19.1rc1
  - 1.2.1
  - 1.2.2
  - 1.2.3
  - 1.20.0
  - 1.20.0rc1
  - 1.20.0rc2
  - 1.20.1
  - 1.20.1rc1
  - 1.21.0rc1
  - 1.21.0rc2
  - 1.21.0rc3
  - 1.21.0rc4
  - 1.3.0
  - 1.4.0
  - 1.4.1
  - 1.5.0
  - 1.6.0
  - 1.7.0
  - 1.8.0
  - 1.8.1
  - 1.9.0
  ecosystem_specific: {}
references:
- type: ADVISORY
  url: https://github.com/onnx/onnx/security/advisories/GHSA-cmw6-hcpp-c6jp
- type: FIX
  url: https://github.com/onnx/onnx/commit/4755f8053928dce18a61db8fec71b69c74f786cb
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N