Catalysis of the reaction: (2Z,4E)-2-hydroxy-6-oxonona-2,4-dienedioate + H2O = (2Z)-2-hydroxypenta-2,4-dienoate + H+ + succinate.
(2E,4Z)-2-hydroxy-6-oxona-2,4-dienedioate succinylhydrolase activity  systematic_synonym