CVE-2026-44512: onnx Null Dereference

Description

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.9.0 before 1.22.0, onnx.version_converter.convert_version() can dereference a null pointer in Upsample_6_7::adapt_upsample_6_7() in onnx/version_converter/adapters/upsample_6_7.h when processing an untrusted model with an Upsample node that has zero inputs, causing an unrecoverable denial of service. This issue is fixed in version 1.22.0.

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CVSS v3.1 Score

5.5

MEDIUM

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

EPSS — Exploit Prediction

0.0019

Probability of exploitation

0.09%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linuxfoundation	onnx	1.9.0 — 1.22.0

References

Advisories & Patches

https://github.com/onnx/onnx/commit/cd310408165ad47c3cd7eb2b86cb5b80aa2e4fdf https://github.com/onnx/onnx/pull/7813 https://github.com/onnx/onnx/security/advisories/GHSA-hwpq-hmq9-wj77 https://github.com/onnx/onnx/security/advisories/GHSA-hwpq-hmq9-wj77

Exploits

https://github.com/onnx/onnx/security/advisories/GHSA-hwpq-hmq9-wj77 https://github.com/onnx/onnx/security/advisories/GHSA-hwpq-hmq9-wj77

Other References

https://github.com/onnx/onnx/releases/tag/v1.22.0

Frequently Asked Questions

What is CVE-2026-44512? +

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.9.0 before 1.22.0, onnx.version_converter.convert_version() can dereference a null pointer in Upsample_6_7::adapt_upsample_6_7() in onnx/version_converter/adapters/upsample_6_7.h when processing an untrusted model with an Upsample node that has zero inputs, causing an unrecoverable denial of service. This issue is fixed in version 1.22.0. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-44512? +

CVE-2026-44512 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0019, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-44512? +

CVE-2026-44512 affects products from linuxfoundation, specifically: onnx. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-44512? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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