A third-party vendor related to Gemini appeared to have suffered a data breach on or before Dec. 13. According to documents obtained by Cointelegraph, hackers gained access to 5,701,649 lines of information pertaining to Gemini customers’ email addresses and partial phone numbers. In the case of the latter, hackers apparently did not gain access to the full phone numbers, as certain numeric digits were obfuscated. After the news came to light, Gemini has since clarified in a blog post that the breach appeared to be "result of an incident at a third-party vendor" but also warned of ongoing "phishing campaigns" as a result of the data leak. 

The leaked database did not include sensitive personal information such as names, addresses and other Know Your Customer information. In addition, some emails were repeated in the document; thus, the number of customers affected is likely lower than the total rows of information. Gemini currently has 13 million active users.