CVE-2026-70652 libvips: Possible heap-based buffer read overflow when resizing and re-encoding a JPEG with gain map

libvips is a fast image processing library with low memory needs. Prior to version 8.18.3, libvips built with libultrahdr support can incorrectly size an output buffer in libvips/foreign/uhdrsave.c within vipsforeignsaveuhdrsetrawhdr when a pipeline enlarges an incoming JPEG to a very large outpu...