There is a MEDIUM severity vulnerability affecting CPython. The email module didn’t properly quote newlines for email headers when serializing an email message allowing for header injection when an email is serialized.
https://mail.python.org/archives/list/[email protected]/thread/QH3BUOE2DYQBWP7NAQ7UNHPPOELKISRW/
https://github.com/python/cpython/pull/122233
https://github.com/python/cpython/issues/121650
https://github.com/python/cpython/commit/4aaa4259b5a6e664b7316a4d60bdec7ee0f124d0
https://github.com/python/cpython/commit/4766d1200fdf8b6728137aa2927a297e224d5fa7