CVE-2026-63632
Low
Description
Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.3.0 until 1.22.0, onnx.version_converter.convert_version() can perform an out-of-bounds read in Gemm_7_6::adapt_gemm_7_6() in onnx/version_converter/adapters/gemm_7_6.h when a Gemm node has input tensors with fewer than two dimensions because B_shape[1], A_shape[0], or A_shape[1] is accessed without a rank check, potentially causing a process crash during an opset 7 to 6 downgrade. This issue is fixed in version 1.22.0.
SeverityLow
CVSS3.3
Exploit probability—
ProductOnnx
PublishedAug 18, 2026
First seenAug 18, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- onnx1.22.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| onnxPyPI | 1.3.0 ≤ v < 1.22.0 | 1.22.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.