A young couple discovered dead in a cabin in the foothills of the NSW Blue Mountains might have died from carbon monoxide poisoning.

The man and the woman, believed to be aged in their 30s, might have been overcome by fumes from a woodchip heater inside the cabin, a Fire & Rescue spokeswoman said.

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Police were called to Browns Road in Kurrajong, on Sydney’s northwest outskirts, about 7.40am on Monday.

Authorities are understood to be investigating whether the pair might have died from carbon monoxide poisoning.

They were part of a group of campers at a temporary campsite, reportedly made up of shipping containers, 2GB reported.
A crime scene has been established.