If this is true, it could send the Middle East into a war that would leave it destroyed (never mind the rest of the world).
Israel has always denied having nuclear weapons because they know that if they ever confirmed it, all their enemies would immediately withdraw from the Nuclear Non-Proliferation Treaty, citing the imminent threat to national security. While most of them probably couldn't develop a nuke anyway, Iran already has a nuclear program, and Saudi Arabia could probably just buy everything they needed to start their own.