Two people have suffered life-threatening stab wounds and a man has been shot following a home invasion at a rural property in Sydney's west.

About 11.20pm on Monday, a man and a woman armed with a gun and a knife reportedly forced their way inside a home in Bringelly, police said.

A man was stabbed in his chest and stomach, and a woman was stabbed in her neck and hand. Another man who was at the property at the time was not injured.

Police found the three occupants at a neighbouring property, and paramedics rushed the man and woman to hospital where they remain in a serious condition.