CVE-2026-42144 CImg Library: Integer overflow in PNM size check bypasses memory guard (_load_pnm)

CImg Library is a C++ library for image processing. Prior to commit 4ca26bc, there is an integer overflow vulnerability in the WHD size computation inside loadpnm that can bypass the memory allocation guard. A crafted PNM/PGM/PPM file with large dimension values causes the overflow to wrap around...