276K accounts from Linux Forums (linuxforums.org) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In May 2018, the Linux Forums website suffered a data breach which resulted in the disclosure of 276k unique email addresses. Running on an old version of vBulletin, the breach also disclosed usernames, IP addresses and salted MD5 password hashes. Linux Forums did not respond to multiple attempts to contact them about the breach.
Source: Have I Been Pwned (CC BY 4.0)