CVE-2026-27489: Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0,
Summary
ONNX (Open Neural Network Exchange, a standard format for sharing machine learning models) versions before 1.21.0 have a path traversal vulnerability via symlink (a shortcut that points to files outside its intended folder), allowing attackers to read arbitrary files outside the model or user-provided directory. This vulnerability has a CVSS score (0-10 severity rating) of 8.7, indicating high severity.
Solution / Mitigation
Update to ONNX version 1.21.0 or later, where this issue has been patched.
Vulnerability Details
EPSS: 0.0%
April 1, 2026
Classification
Affected Vendors
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Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-27489
First tracked: April 1, 2026 at 08:08 PM
Classified by LLM (prompt v3) · confidence: 92%