SDL_ttf v2.0.18 and below was discovered to contain an arbitrary memory write via the function TTF_RenderText_Solid(). This vulnerability is triggered via a crafted TTF file.
https://github.com/libsdl-org/SDL_ttf/issues/187
https://github.com/libsdl-org/SDL_ttf/commit/db1b41ab8bde6723c24b866e466cad78c2fa0448