Vulnerability · Published Jul 8, 2026 · Assigned by GitHub_M
CVE-2026-44512ONNX: Null Pointer Dereference in Upsample Version Converter Adapter (Zero Inputs)
Medium 5.5
In plain English
A medium-severity null pointer dereference in onnx from onnx. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | onnx | no fix listed | DEBIAN-CVE-2026-44512 |
| Debian:13 | onnx | no fix listed | DEBIAN-CVE-2026-44512 |
| Debian:14 | onnx | no fix listed | DEBIAN-CVE-2026-44512 |
| PyPI | onnx | 1.22.0 | GHSA-hwpq-hmq9-wj77 |
| PyPI | onnx | 1.22.0 | PYSEC-2026-2689 |
| Ubuntu:22.04:LTS | onnx | no fix listed | UBUNTU-CVE-2026-44512 |
| Ubuntu:25.10 | onnx | no fix listed | UBUNTU-CVE-2026-44512 |
| Ubuntu:26.04:LTS | onnx | no fix listed | UBUNTU-CVE-2026-44512 |
| Ubuntu:26.10 | onnx | no fix listed | UBUNTU-CVE-2026-44512 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- https://github.com/onnx/onnx/security/advisories/GHSA-hwpq-hmq9-wj77 x_refsource_CONFIRM
- https://github.com/onnx/onnx/pull/7813 x_refsource_MISC
- https://github.com/onnx/onnx/commit/cd310408165ad47c3cd7eb2b86cb5b80aa2e4fdf x_refsource_MISC
- https://github.com/onnx/onnx/releases/tag/v1.22.0 x_refsource_MISC