From the BBC:
PGP (Pretty Good Privacy) is a data encryption method sometimes added to programs that send and receive email.
Details about the vulnerability were released by the Suddeutsche Zeitung newspaper prior to a scheduled embargo.
Previously, the Electronic Frontier Foundation (EFF) had advised immediately disabling email tools that automatically decrypted PGP.
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From group that discovered vulnerability.
EFAIL describes vulnerabilities in the end-to-end encryption technologies OpenPGP and S/MIME that leak the plaintext of encrypted emails.