affected:
- package:
    ecosystem: PyPI
    name: onnx
    purl: pkg:pypi/onnx
  ranges:
  - events:
    - introduced: '0'
    - fixed: 1.21.0
    type: ECOSYSTEM
  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
aliases:
- CVE-2026-34447
- GHSA-p433-9wv8-28xj
details: Open Neural Network Exchange (ONNX) is an open standard for machine learning
  interoperability. Prior to version 1.21.0, there is a symlink traversal vulnerability
  in external data loading allows reading files outside the model directory. This
  issue has been patched in version 1.21.0.
id: PYSEC-2026-104
modified: '2026-05-20T09:19:09.984613Z'
published: '2026-04-01T18:16:30.810Z'
references:
- type: EVIDENCE
  url: https://github.com/onnx/onnx/security/advisories/GHSA-p433-9wv8-28xj
severity:
- score: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
  type: CVSS_V3