DSA-6263-1 libpng1.6 - security update

USN-8251-1: libpng vulnerabilities

CVE-2026-34757 LIBPNG has a yse-after-free in png_set_PLTE, png_set_tRNS and png_set_hIST leading to corrupted chunk data and potential heap information disclosure

Multiples vulnérabilités dans les produits Microsoft (15 avril 2026)