Debian 12: DSA-5752-1 Critical: Dovecot IMAP Denial Of Service

Two vulnerabilities have been discovered in the IMAP implementation of
the Dovecot mail server: Excessive numbers of address headers or very
large headers can result in high CPU usage, leading to denial of
service.

For the stable distribution (bookworm), these problems have been fixed in
version 1:2.3.19.1+dfsg1-2.1+deb12u1.

We recommend that you upgrade your dovecot packages.

For the detailed security status of dovecot please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/dovecot

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/