def scriptPath(*pathSegs):
    startPath = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
    return os.path.join(startPath, *pathSegs)
The software 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 software 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.