- CVE-2026-27852: bound the transient RFC 2231 parameter list and the MIME parameter budget so a single oversized Content-Type header cannot exhaust imap memory - CVE-2026-33263: track SMTP server connection closure so submission-login does not keep using a closed connection - CVE-2026-33605: fix ManageSieve parser handling of a single-byte quoted string read in managesieve-login - CVE-2026-40018: connect before expanding the passdb-sql password query and refuse to escape in the MySQL driver without a connection instead of escaping with the default charset - CVE-2026-42007: fix Sieve editheader edit-mail handling of deleted and NUL-containing header values - CVE-2026-42391: account external key/value pairs in the IMAP login ID command so a client cannot send an unbounded number of them - CVE-2026-73208: validate the OAuth2 token audience and stop falling back to the aud claim when audience is configured