Low-x physics results from CMS

The internal structure of hadrons at low momentum fractions is known only poorly. However, it is important, for example, to understand background processes at hadron colliders. The parton density rises fast with decreasing values of x. This growth is dominated by gluons and at some critical scale the gluon density will enter a state of saturation. The production of jets is sensitive to the partonic structure of hadrons. We report on recent results on forward and multiple hard jet production in pp collisions at CMS. Correlations between central and forward jet production are studied as well as additional jet radiation in events with dijets at large rapidity separation. Also the forward and very forward directed energy flow in pp and PbPb collisions are presented.