Harold is best known for playing Teri Hatcher's character's boyfriend on "Desperate Housewives," as well as Brian on "Queer as Folk."
TMZ said he is in the Intensive Care Unit of Los Angeles County-USC Medical Center following Tuesday's crash.
The report did not give any details regarding the incident or the nature of Harold's injuries.
Aaron Carter will 'shut up' about ex Hilary Duff
Sophia Loren celebrates 80th birthday