Medium severity · published Jul 8, 2026
CVE-2026-44512
ONNX: Null Pointer Dereference in Upsample Version Converter Adapter (Zero Inputs)
5.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ON
onnx · onnx
>= 1.9.0, < 1.22.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44512
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44512
Patch
https://github.com/onnx/onnx/commit/cd310408165ad47c3cd7eb2b86cb5b80aa2e4fdf
Issue Tracking
https://github.com/onnx/onnx/pull/7813
Product
https://github.com/onnx/onnx/releases/tag/v1.22.0
Exploit
https://github.com/onnx/onnx/security/advisories/GHSA-hwpq-hmq9-wj77
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