candelbra base too long, is it safe?
If the lamp is properly wired, the shell of the socket is connected to neutral. This means that, under normal conditions, the voltage on the shell is minimal vs. ground and so this is generally safe. However, in case of an open neutral or a miss-wired socket with hot on the shell, this could expose lethal voltages.

If this a chandelier which is out of reach, I'd not hesitate to use this bulb. Otherwise, I'd prefer to use a better fitting bulb.