EUVD-2026-122790

IMAP4.starttls wraps the socket in TLS but leaves self.readbuf, imaplib's own read-ahead buffer, untouched. Any plaintext bytes that arrived in the same recv as the tagged OK to STARTTLS are returned by readline after the handshake, so the client treats them as the first responses on the protecte...

PT-2026-144403

IMAP4.starttls wraps the socket in TLS but leaves self. readbuf, imaplib's own read-ahead buffer, untouched. Any plaintext bytes that arrived in the same recv as the tagged OK to STARTTLS are returned by readline after the handshake, so the client treats them as the first responses on the protect...