145K accounts from Linux Mint (linuxmint.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In February 2016, the website for the Linux distro known as Linux Mint was hacked and the ISO infected with a backdoor. The site also ran a phpBB forum which was subsequently put up for sale complete with almost 145k email addresses, passwords and other personal subscriber information.
Source: Have I Been Pwned (CC BY 4.0)