You are being misled by deceitful people in your waking life. You must try to exert a greater control over your own life and action. goodluck cheers from Singapore
It typically means you are bored with your life or you feel trapped. It's a surprisingly common theme. If you see zombies in a siege scenario, it definitely means you want some changes to happen, but feel that things are going too slow.
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I think one needs to consider the entire dream and within the context of what is going on within one's own life at the time of the dream. By itself, dreaming of zombies probably doesn't mean a whole lot.