libglusterfs/src/compat.c:

char *
mkdtemp (char *tempstring)
{
    ...
        new_string = mktemp (tempstring);
        if (!new_string)
                goto out;
    ...
}

mktemp(3) is deprecated, use mkstemp(3).

Some implementations follow 4.3BSD and replace XXXXXX by the current process ID and a single letter, so that at most 26 different names can be returned.  Since on the one hand the names are easy to guess, and on the other hand there is a race between testing whether the name exists and opening the file, every use of mktemp() is a security risk. The race is avoided by mkstemp(3).