Code: MagickExport void *DetachBlob(BlobInfo *blob_info)
{
  void
    *data;

  assert(blob_info != (BlobInfo *) NULL);
  if (blob_info->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
   if (blob_info->mapped != MagickFalse)
     {
       (void) UnmapBlob(blob_info->data,blob_info->length);
       RelinquishMagickResource(MapResource,blob_info->length);
     }
   blob_info->mapped=MagickFalse;
  blob_info->length=0;
  blob_info->offset=0;
  blob_info->eof=MagickFalse;
  blob_info->error=0;
  blob_info->exempt=MagickFalse;
  blob_info->type=UndefinedStream;
  blob_info->file_info.file=(FILE *) NULL;
  data=blob_info->data;
  blob_info->data=(unsigned char *) NULL;
  blob_info->stream=(StreamHandler) NULL;
  blob_info->custom_stream=(CustomStreamInfo *) NULL;
  return(data);
}

Vulnerability Type: DoS 
CWE ID: CWE-416
Summary: In ImageMagick 7.x before 7.0.8-42 and 6.x before 6.9.10-42, there is a use after free vulnerability in the UnmapBlob function that allows an attacker to cause a denial of service by sending a crafted file.
Commit Message: https://github.com/ImageMagick/ImageMagick6/issues/43