CVE-2026-107736 SumatraPDF: stack buffer overflow while processing EXIF Orientation metadata

SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, MaybeFlipBitmap asks GDI+ to read the attacker-controlled PropertyTagOrientation size through GetPropertyItem while supplying only a fixed 64-byte buf on the stack. Opening a crafted TIFF with enough EXIF Orientation values ca...