static CURLcode smtp_continue_auth(struct connectdata *conn, const char *resp)
{
  struct smtp_conn *smtpc = &conn->proto.smtpc;

  return Curl_pp_sendf(&smtpc->pp, "%s", resp);
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.