Ubuntu Security Notice 3964-1 - Marcus Brinkmann discovered that GnuPG before 2.2.8 improperly handled certain command line parameters. A remote attacker could use this to spoof the output of GnuPG and cause unsigned e-mail to appear signed. It was discovered that python-gnupg incorrectly handled the GPG passphrase. A remote attacker could send a specially crafted passphrase that would allow them to control the output of encryption and decryption operations. Various other issues were also addressed.
4032858588d1e2658d61e5efd5e46c841d62a00dde590953eebf108edf5c4102