92M accounts from MyHeritage (myheritage.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In October 2017, the genealogy website MyHeritage suffered a data breach. The incident was reported 7 months later after a security researcher discovered the data and contacted MyHeritage. In total, more than 92M customer records were exposed and included email addresses and salted SHA-1 password hashes. In 2019, the data appeared listed for sale on a dark web marketplace (along with several other large breaches) and subsequently began circulating more broadly.
Source: Have I Been Pwned (CC BY 4.0)