Home/CVE/Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0,
CVE

CVE-2026-34447

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0,

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.

MEDIUM · CVSS 5.5 EPSS 5e-05
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

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

Affected Products & Versions

1
linuxfoundation onnx< 1.21.0
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
PyPI onnx MODERATE fixed in 1.21.0
⚠

Public Exploits & PoCs

1
pocgithub.com · GHSA-p433-9wv8-28xjgithub.com
▣

Scoring & Timeline

5.5
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Apr 2026 · 06:16 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
partial
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