We present a search for new physics in events with one or two low-momentum leptons and missing transverse energy, based on the first proton-proton integrated luminosity recorded with the CMS detector at 13 TeV. The final state can be the phenomenology of SUSY models foreseeing a small mass splitting between the lightest supersymmetric particle and e.g. the top squark or chargino, in the so called compressed mass spectra scenario. The event selection and kinematics, together with methods for estimating the standard model backgrounds are presented. Results are interpreted in terms on SUSY models where a compressed mass scenario is foreseen.