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tonydav41
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onnx-shape-inference-poc-custom-function-recursion-2026-05-12

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ONNX shape inference custom function recursion PoC

Private evidence package for authorized huntr / ONNX MFF research.

Target

Package: onnx==1.21.0
API: onnx.shape_inference.infer_shapes_path
Payload: payload.onnx
Result: process termination by SIGSEGV / shell return code 139

Reproduce

python3 -m venv /tmp/onnx-poc-venv
/tmp/onnx-poc-venv/bin/python -m pip install onnx==1.21.0
/tmp/onnx-poc-venv/bin/python -c 'import onnx; m = onnx.load("payload.onnx"); onnx.checker.check_model(m); print("check ok")'
/tmp/onnx-poc-venv/bin/python -c 'import onnx; m = onnx.load("payload.onnx"); onnx.shape_inference.infer_shapes_path("payload.onnx")'

Expected: onnx.load() and onnx.checker.check_model() succeed; shape inference terminates with return code 139.

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