CVE-2026-63632 ONNX: Heap-Buffer-Overflow READ in Gemm Version Converter Adapter via Undersized Input Shape

Open Neural Network Exchange ONNX is an open standard for machine learning interoperability. From 1.3.0 until 1.22.0, onnx.versionconverter.convertversion can perform an out-of-bounds read in Gemm76::adaptgemm76 in onnx/versionconverter/adapters/gemm76.h when a Gemm node has input tensors with...

CVE-2026-63632 ONNX: Heap-Buffer-Overflow READ in Gemm Version Converter Adapter via Undersized Input Shape

Open Neural Network Exchange ONNX is an open standard for machine learning interoperability. From 1.3.0 until 1.22.0, onnx.versionconverter.convertversion can perform an out-of-bounds read in Gemm76::adaptgemm76 in onnx/versionconverter/adapters/gemm76.h when a Gemm node has input tensors with...

CVE-2026-63632

onnx versions 1.3.0–1.22.0 have an unchecked rank access in Gemm_7_6::adapt_gemm_7_6() (gemm_7_6.h:41) when downgrading opset 7→6; a Gemm node with undersized input tensors triggers a 16-byte heap-buffer-overflow READ. A working 186-byte PoC exists. Upgrade to onnx ≥1.22.0.

MINI-4PQC-4FFF-7VJQ

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