Numerous stories around the 'net on the leak. The report at Five million Gmail addresses and passwords dumped online - CSO | The Resource for Data Security Executives includes the information that it appears the leaked passwords are for non-Gmail/Google accounts, rather accounts on other sites where the Gmail address was the user name. Still wise to change your password.
Check at https://isleaked.com/en.php to find out if your Google account is on the list.
An archive containing nearly 5 million Gmail addresses and plain text passwords was posted Tuesday on an online forum, but the data is old and likely sourced from multiple data breaches according to one security firm.
Check at https://isleaked.com/en.php to find out if your Google account is on the list.