Language: C
Label: vulnerable
CWE: CWE-22 \u2014 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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.

Code:
static int http1_on_error(http1_parser_s *parser) {
  FIO_LOG_DEBUG("HTTP parser error at HTTP/1.1 buffer position %zu/%zu",
                parser->state.next - parser2http(parser)->buf,
                parser2http(parser)->buf_len);
  fio_close(parser2http(parser)->p.uuid);
  return -1;
}