An issue was discovered in Qt before 5.11.3. A malformed SVG image causes a segmentation fault in qsvghandler.cpp. An issue was discovered in Qt before 5.11.3. A malformed GIF image causes a NULL pointer dereference in QGifHandler resulting in a segmentation fault. An issue was discovered in Qt 5.11. A malformed PPM image causes a division by zero and a crash in qppmhandler.cpp. QXmlStream in Qt 5.x before 5.11.3 has a double-free or corruption during parsing of a specially crafted illegal XML document. An issue was discovered in Qt before 5.11.3. QBmpHandler has a buffer overflow via BMP data. An issue was discovered in Qt before 5.11.3. There is QTgaFile Uncontrolled Resource Consumption