CVE-2026-77652 Dia: dia: heap buffer overflow in wpg colormap parser via out-of-bounds palette index

A heap-based buffer overflow vulnerability exists in the Dia diagram editor WPG file format importer. In plug-ins/wpg/wpg-import.c, the WPG import renderer allocates a fixed palette with: ren-pPal = gnew0WPGColorRGB, 256; When handling a WPGCOLORMAP record, the parser reads a start index i16 and...

CVE-2026-77652

A heap-based buffer overflow in the Dia diagram editor's WPG file importer (plug-ins/wpg/wpg-import.c ) allows out-of-bounds writes into a fixed 256-entry color palette. The WPG_COLORMAP record handler validates the start index only against the WPG record size, not the palette capacity, so a craf...