Researchers claim robots could poison family members and pets by mixing toxic substances with food or drinks.
But a top security firm claims that robots including those currently on the market could attack humans, burgle homes and wreak havoc on a factory floor.
There have already been serious accidents including a bride-to-be who was crushed to death by a robot just two weeks before she was due to marry the love of her life.
A robot cannon also killed nine soldiers and seriously injured 14 others during a US military exercise in 2007.
But researchers at IOActive who famously revealed how to hack a jeep remotely while it was zooming along at high speed are concerned over how easy it is to hack a robot and make it do nasty things to humans and even their pets.
They found that several of the robots could be hacked remotely.
Hacked robots "are more dangerous" than hacked computers because the addition of arms, legs or wheels could cause serious harm, IOActive claimed.
In a report, released on Wednesday, IOActive's Cesar Cerrudo wrote: "A hacked robot operating inside a home might spy on a family via the robotís microphones and cameras.