---
id: CVE-2026-63632
title: >-
  Open Neural Network Exchange (ONNX) is an open standard for machine learning
  interoperability
summary: >-
  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/vers…
severity: low
cvss: 3.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'
cwe:
  - CWE-125
vendor: onnx
product: onnx
affected:
  - 'onnx >= 1.3.0, <= 1.21.0'
patched:
  - onnx 1.22.0
published: '2026-08-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:05:53.723'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63632'
references:
  - url: >-
      https://github.com/onnx/onnx/commit/e9c74f596eaa0250f89e52a54160a25bbcb25b66
    label: security-advisories@github.com
  - url: 'https://github.com/onnx/onnx/pull/7880'
    label: security-advisories@github.com
  - url: 'https://github.com/onnx/onnx/releases/tag/v1.22.0'
    label: security-advisories@github.com
  - url: 'https://github.com/onnx/onnx/security/advisories/GHSA-p893-rvq9-2xf9'
    label: security-advisories@github.com
  - url: 'https://github.com/onnx/onnx/security/advisories/GHSA-p893-rvq9-2xf9'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-p893-rvq9-2xf9'
tags:
  - nvd
  - ghsa
  - pip
epss: 0.00168
epssPercentile: 0.05358
aliases:
  - GHSA-p893-rvq9-2xf9
ecosystem: pip
ingestedAt: '2026-07-24T16:33:09.825Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-63632)

Affected packages:

- `onnx >= 1.3.0, <= 1.21.0`

Patched in:

- `onnx 1.22.0`

Source: https://github.com/advisories/GHSA-p893-rvq9-2xf9