ONNX: Null Pointer Dereference in ScanInferenceFunction Due to Missing Required Attribute

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-115921
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-26 18:17:39 UTC
Updated2026-10-26 18:34:17 UTC
DescriptionOpen 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.

Risk And Classification

Primary CVSS: v3.1 6.2 MEDIUM from [email protected]

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

Problem Types: CWE-195 | CWE-476 | CWE-195 CWE-195: Signed to Unsigned Conversion Error | CWE-476 CWE-476: NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.2MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED6.2MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Onnx Onnx affected >= 1.4.0, < 1.22.0 Not specified

References

ReferenceSourceLinkTags
github.com/onnx/onnx/pull/7916 [email protected] github.com
github.com/onnx/onnx/commit/dd6bc92ea39fd2274fd671f0734b0b8b558356f5 [email protected] github.com
github.com/onnx/onnx/security/advisories/GHSA-m4pr-6v3c-6fgr [email protected] github.com
github.com/onnx/onnx/releases/tag/v1.22.0 [email protected] github.com
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