Fedora Account System
Red Hat Associate
Red Hat Customer
Sending specially crafted email can cause mailbox to have permanently unaccessible mail, or the mail can be stuck in delivery.
External References: https://dovecot.org/pipermail/dovecot-news/2020-February/000430.html
This issue is already addressed in Fedora via the following updates: Fedora-30-testing: http://koji.fedoraproject.org/packages/dovecot/2.3.9.3/1.fc30 Fedora-31-testing: http://koji.fedoraproject.org/packages/dovecot/2.3.9.3/1.fc31
Upstream commit: https://github.com/dovecot/core/commit/3a55f35c208b5fd3d52c0a6272bd5b8717a2ae54