The striker's header in the second minute of stoppage time condemned Heracles to a third consecutive Eredivisie defeat on Friday and Jan de Jonge's men remain bottom of the Dutch top flight.
Oussama Tannane's second-half dismissal presented the home side with an uphill task and Hemmen left it late to wrap up the points for Cambuur with a near-post header from a corner.
The visitors suffered a fright of their own when Wout Droste was left prone on the turf after a poor challenge from Fahd Aktaou.
He was forced from the field after 53 minutes and taken to hospital, while Aktaou, who had already been booked, escaped further sanction.
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