Bulging instability is a mechanical failure that happens when a thin tube undergoes excessive localized deformation before ultimately failing. Understanding this process is crucial in ensuring the stability of various mechanical and biological systems, such as fluid-carrying rubber tubes and aneurysms in the human brains. In this numerical study, we used the finite element method and a hyperelastic material to simulate bulging instability in a closed-end tube. Our findings reveal that inflation only occurs when the internal pressure in the tube reaches a critical value, which depends on the tube's thickness but not its length. Further analysis of the poro-hyperelastic tube demonstrates that the presence of porosity lowers the critical pressure required for inflation by reducing the stresses in the tube material.