The invention relates to a vehicle occupant restraint system (10) for a vehicle comprising an inflator (14) and an airbag (12) connected to the inflator (14). The inflator (14) includes a mounting extension (42) which is provided for mounting the inflator (14) on a vehicle part (18) and projects through an orifice in the airbag (12). A sealing assembly (58) arranged at the mounting extension (42) is provided which clamps the airbag (12) against the inflator (14) and seals the orifice in the airbag (12). Furthermore, the invention relates to a sealing element (60) having a closed annular sealing body (68) including at least one lateral extension (64, 66) which extends in the central plane (E) of the sealing body (68).