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CVE-2026-34445

8.6 · HIGH

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability.

Published Apr 1, 2026CWE-20EPSS 0.51%

Overview

CVE-2026-34445 is a high-severity vulnerability. It was published on April 1, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/onnx/onnx/commit/e30c6935d67cc3eca2fa284e37248e7c0036c46bGitHubgithub.com/onnx/onnx/pull/7751GitHubgithub.com/onnx/onnx/security/advisories/GHSA-538c-55jv-c5g9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-34445?

CVE-2026-34445 is a high-severity vulnerability. It was published on April 1, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2026-34445?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-34445?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-34445?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-34445 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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