QPixmap::loadFromData crashes with QCoreApplication

I have a server application (using QCoreApplication) which is trying to load some data into QPixmap using QPixmap::loadFromData(loadFromData(const QByteArray &buf, const char *format, Qt::ImageConversionFlags flags).

It crashes with the following stack trace (MSVC 2013);:

 	Qt5Guid.dll!QPlatformPixmap::create(int w=0, int h=0, QPlatformPixmap::PixelType type=PixmapType) Line 55	C++
 	Qt5Guid.dll!QPixmap::loadFromData(const unsigned char * buf=0x0344b068, unsigned int len=3584, const char * format=0x00000000, QFlags<enum Qt::ImageConversionFlag> flags={...}) Line 827	C++
 	Qt5Guid.dll!QPixmap::loadFromData(const QByteArray & buf={...}, const char * format=0x00000000, QFlags<enum Qt::ImageConversionFlag> flags={...}) Line 214	C++

It works fine if I use a QApplication instead of QCoreApplication.

This looks similar to QTBUG-17873 from Qt 4.x, but that fix doesn't seem to be in 5.5.1.

It doesn't seem to be documented anywhere that QPixmap requires a QApplication.