Hydrolyzes glycosphingolipids; exhibits broad substrate specificity including monosialodihexosylganglioside (GM3), monosialotetrahexosylganglioside (GM1), fucosyl-GM1, lactosylceramide, globotriosylceramide, globotetraosylceramide, ganglioside GD1a, and ganglioside GD1b (PubMed:28179425). No activity towards glucosylceramide and galactosylceramide (PubMed:28179425). an oligoglycosyl-(1->4)-beta-D-glucosyl-(1<->1)-ceramide + H2O = an N-acyl-sphingoid base + an oligoglycosyl-(1->4)-D-glucose ganglioside GM3 + H2O = an N-acyl-sphingoid base + N-acetyl-alpha-neuraminosyl-(2->3)-beta-D-galactosyl-(1->4)-D-glucose ganglioside GM1 + H2O = an N-acyl-sphingoid base + beta-D-Gal-(1->3)-beta-D-GalNAc-(1->4)-[alpha-Neu5Ac-(2->3)]-beta-D-Gal-(1->4)-D-Glc ganglioside Fuc-GM1 + H2O = alpha-Fuc-(1->2)-beta-Gal-(1->3)-beta-GalNAc-(1->4)-[alpha-Neu5Ac-(2->3)]-beta-Gal-(1->4)-Glc + an N-acyl-sphingoid base beta-D-galactosyl-(1->4)-beta-D-glucosyl-(1<->1)-ceramide + H2O = an N-acyl-sphingoid base + lactose kcat is 10.5 sec(-1) with monosialotetrahexosylganglioside as substrate. Belongs to the glycosyl hydrolase 5 (cellulase A) family.