Santiago Torres-Arias

A vulnerability in Log4j, a humble but widespread piece of software, has put millions of computers at risk. SOPA Images/LightRocket via Getty Images

What is Log4j? A cybersecurity expert explains the latest internet vulnerability, how bad it is and what’s at stake

Log4Shell is the latest hacker exploit rocking the internet, and it’s arguably the worst yet. The vulnerability is in an obscure piece of software used on millions of computers.

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