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Description

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, the ExternalDataInfo class in ONNX was using Python’s setattr() function to load metadata (like file paths or data lengths) directly from an ONNX model file. It didn’t check if the "keys" in the file were valid. Due to this, an attacker could craft a malicious model that overwrites internal object properties. This issue has been patched in version 1.21.0.

PUBLISHED Reserved 2026-03-27 | Published 2026-04-01 | Updated 2026-04-01 | Assigner GitHub_M




HIGH: 8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Problem types

CWE-20: Improper Input Validation

CWE-400: Uncontrolled Resource Consumption

CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes

Product status

< 1.21.0
affected

References

github.com/onnx/onnx/security/advisories/GHSA-538c-55jv-c5g9

github.com/onnx/onnx/pull/7751

github.com/...ommit/e30c6935d67cc3eca2fa284e37248e7c0036c46b

cve.org (CVE-2026-34445)

nvd.nist.gov (CVE-2026-34445)

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