LIBPNG has an integer truncation causing heap buffer over-read in png_image_write_*

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AZL-70856 CVE-2025-64506 affecting package gdal 3.6.3-2

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG Portable Network Graphics raster image files. From version 1.6.0 to before 1.6.51, a heap buffer over-read vulnerability exists in libpng's pngwriteimage8bit function when processing 8-bit images through t...