The White House is holding a meeting today with tech leaders to discuss Log4j and other potential vulnerabilites.

“The log4j vulnerability is the most serious vulnerability I have seen in my decades-long career,” Jen Easterly, the director of the US Cybersecurity and Infrastructure Security Agency, said.

A new Apache Log4j vulnerability and a major attack on a military body using Log4Shell have come to light as security teams work to patch.

Here’s what you should know: What is Log4j and why does it matter? Log4j is one of the most popular logging libraries used online, according to cybersecurity experts.