From securityaffairs.co
Researchers found critical vulnerabilities in PGP and S/MIME Tools, immediately disable and/or uninstall tools that automatically decrypt PGP-encrypted email.
If you are one of the users of the email encryption tools Pretty Good Privacy and S/MIME there is an important warning for you.
A group of European security expert has discovered a set of critical vulnerabilities in PGP and S/Mime encryption tools that could reveal your encrypted emails in plain text, also the ones you sent in the past.
More information here