GHSA-8Q6G-VJHF-JP8M psd-tools composite/numpy has uncontrolled memory allocation via crafted PSD geometry

Summary PSDImage.composite and .numpy allocate the output image buffer from the PSD's header geometry width × height × channels × depth, and per-layer rectangles before validating those values against the actual file contents. A tiny crafted PSD declaring huge dimensions causes a multi-gigabyte...