local int bail(char *why, char *what)
{
    if (g.outd != -1 && g.outf != NULL)
        unlink(g.outf);
    complain("abort: %s%s", why, what);
    exit(1);
    return 0;
}

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.