GHSA-jggw-2q6g-c3m6 Out-of-bounds Read in OpenCV

• PyPI opencv-python: < 4.1.0.25 → fixed in 4.1.0.25 • PyPI opencv-python-headless: < 4.1.0.25 → fixed in 4.1.0.25 • PyPI opencv-contrib-python: < 4.1.0.25 → fixed in 4.1.0.25 • PyPI opencv-contrib-python-headless: < 4.1.0.25 → fixed in 4.1.0.25

An out-of-bounds read was discovered in OpenCV before 4.1.1 (OpenCV-Python before 4.1.0.25). Specifically, variable coarsest_scale is assumed to be greater than or equal to finest_scale within the calc()/ocl_calc() functions in dis_flow.cpp. However, this is not true when dealing with small images, leading to an out-of-bounds read of the heap-allocated arrays Ux and Uy.