Paulino do Rego Barros, Jr., left, interim Chief Executive Officer of Equifax, Inc., sitting with Richard Smith, center, former Chief Executive Officer of Equifax, Inc., and former Yahoo! Chief Executive Officer Marissa Mayer, right, speaks as he testifies before the Senate Commerce Committee on Capitol Hill in Washington, Wednesday, Nov. 8, 2017, during a hearing on “Protecting Consumers in the Era of Major Data Breaches” after the 2013 data breach at Yahoo! that affected 3 billion user accounts. Credit: AP/Susan Walsh

A new data leak could affect hundreds of millions of Americans, perhaps more than the nearly 150 million affected by the Equifax breach.

Exactis, a Florida-based marketing and data-aggregation firm, leaked detailed information on individual adults and businesses, a security researcher says. While the exact number of individuals affected isn’t known, the leak involved about 340 million records on a publicly available server.

Wired was the first to report that the exposed information included phone numbers, home addresses, email addresses and personal characteristics for every name, such as interests and habits, plus the number, […]