CVE-2026-34445

HIGH

8.6

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.

CVE Details

CVSS v3.1 Score8.6

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/1/2026

Last Modified4/3/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-20CWE-400CWE-915

References

https://github.com/onnx/onnx/commit/e30c6935d67cc3eca2fa284e37248e7c0036c46b(security-advisories@github.com)

https://github.com/onnx/onnx/pull/7751(security-advisories@github.com)

https://github.com/onnx/onnx/security/advisories/GHSA-538c-55jv-c5g9(security-advisories@github.com)

IOC Correlations

No correlations recorded

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