What’s Vulnerable › Vulnerabilities

CVE-2026-44512: ONNX: Null Pointer Dereference in Upsample Version Converter Adapter (Zero Inputs)

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-08 · updated 2026-07-13
• Weakness: CWE-476

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.

Affected products

• onnx: from 1.9.0 before 1.22.0 — fixed in 1.22.0

How to fix

Upgrade to a fixed version: onnx 1.22.0. Check the vendor advisory for mitigations.

References

• https://github.com/onnx/onnx/commit/cd310408165ad47c3cd7eb2b86cb5b80aa2e4fdf
• https://github.com/onnx/onnx/pull/7813
• https://github.com/onnx/onnx/releases/tag/v1.22.0
• https://github.com/onnx/onnx/security/advisories/GHSA-hwpq-hmq9-wj77
• https://github.com/onnx/onnx/security/advisories/GHSA-hwpq-hmq9-wj77

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