Medium 6.2Published Oct 26, 2026

CVE-2026-115921ONNX: Null Pointer Dereference in ScanInferenceFunction Due to Missing Required Attribute

Updated under an hour ago (Oct 30, 2026, 2:30 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.4.0 until 1.22.0, ScanInferenceFunction, ScanInferenceFunction_opset8, and ScanInferenceFunction_opset9 do not safely validate the required num_scan_inputs attribute. A missing attribute is dereferenced as a null pointer, while a negative value is converted to size_t and can reach an exceptional oversized allocation path. An untrusted model can therefore terminate or disrupt shape inference, including a negative-value model that can pass onnx.checker.check_model(). This issue is fixed in version 1.22.0.

CVSS: 6.2 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-195, CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 26, 2026

Affected products

Affected products

onnx onnx onnx:onnx (from the name)	from 1.4.0, < 1.22.0	CNA record

References

References

https://github.com/onnx/onnx/security/advisories/GHSA-m4pr-6v3c-6fgr	x-refsource-confirm
https://github.com/onnx/onnx/pull/7916	x-refsource-misc
https://github.com/onnx/onnx/commit/dd6bc92ea39fd2274fd671f0734b0b8b558356f5	x-refsource-misc
https://github.com/onnx/onnx/releases/tag/v1.22.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.