[ CVE-2026-115920 · Published 26 Oct 2026 ]

ONNX: Out-of-bounds read in ConvTranspose shape inference via undersized weight rank

CVSS 6.2 EPSS <1%Fix available

[ Description ]Official description

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.2.1 until 1.22.0, ConvTranspose shape inference processes a weight tensor with fewer than three dimensions without a kernel_shape attribute by deriving an empty effective_kernel_shape and indexing it for the input's spatial dimensions. The flaw affects convTransposeShapeInference_opset11() and the current inference path, and an untrusted model that can pass onnx.checker.check_model() can crash onnx.shape_inference.infer_shapes(), causing denial of service without demonstrated confidentiality or integrity impact. This issue is fixed in version 1.22.0.

[ Fixes ]Fixes and patches

  • onnx 1.22.0Fixed version · GitHub Advisories · pip package onnx: upgrade to 1.22.0 or later (affected >= 1.2.1, <= 1.21.0)

[ Packages ]Affected open-source packages