CVE-2026-77118 Out-of-bounds write in GraphicsMagick PCD decoder

A heap out-of-bounds write exists in the Photo CD PCD decoder of GraphicsMagick. In DecodeImage coders/pcd.c, the Huffman delta loop advances its output pointer with q++ after every decoded delta and never checks it against the end of the heap-allocated luma/chroma plane buffers. The pointer is...