The present disclosure relates to a grommet for guiding one or more cables through an opening in a component. The grommet has a first shell element made of a first form-stable plastic and at least partly surrounding the outer circumference of the cable. The grommet also has a second shell element joined to the first shell element and at least partly surrounding the outer circumference of the cable and defining together with the first shell element a guide channel sealed in the circumferential direction of the cable, to guide the cable through the opening in the component. A sealant consisting of a foamed second plastic is introduced into the guide channel to longitudinally seal the grommet against water. The present disclosure also relates to a method for producing such a grommet.