Security researchers have discovered a vulnerability in the system software used in millions of computers, opening the possibility that attackers could execute arbitrary commands on web servers, other Linux-based machines and even Mac computers.

Some researchers say Shellshock, which affects an application called Bash (which is why it’s often simply called the “Bash Bug”), is potentially more serious and widespread than the Heartbleed bug discovered in April, though the two vulnerabilities are quite different in nature.

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