JLSEC-2026-841

In WriteOnePNGImage of the PNG coder at coders/png.c, an improper call to AcquireVirtualMemory and memset allows for an out-of-bounds write later when PopShortPixel from MagickCore/quantum-private.h is called. The patch fixes the calls by adding 256 to rowbytes. An attacker who is able to supply ...