Recent Results on Forward Physics from the CMS Experiment

It is one of the aims of the CMS experiment at the LHC to improve the understanding of hadronicmultiparticle production and QCD in general. Of particular interest to the astroparticle physics community are theforward physics results, which probe the phase space where most of the primary energy in high energy collisionsflows to. On the other hand the forward region is also where the small-x part of the hadronic wave-functions canbe studied best. The parton distribution in hadrons at small-x is most uncertain and, for example, the search for theonset of saturation is ongoing. Data from CMS are already improving the hadronic event generators available tothe analysis of cosmic ray data. Here we are reviewing some of the latests developments.