ImageMagick 7.0.11-14 has a memory leak in AcquireSemaphoreMemory in semaphore.c and AcquireMagickMemory in memory.c.
The MITRE CVE dictionary describes this issue as:
ImageMagick 7.0.11-14 has a memory leak in AcquireSemaphoreMemory in semaphore.c and AcquireMagickMemory in memory.c.