Update to version 3.0.12 of cyrus-imapd, which includes (among other fixes) a fix for CVE-2019-18928. https://www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.12.html
Updates may require up to 24 hours to propagate to mirrors. If the following command doesn't work, please retry later:
sudo dnf upgrade --refresh --advisory=FEDORA-2019-03be160f9c
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