Upstream has issued advisories today (February 12): https://dovecot.org/pipermail/dovecot-news/2020-February/000431.html https://dovecot.org/pipermail/dovecot-news/2020-February/000430.html The issues are fixed upstream in 2.3.9.3: https://dovecot.org/pipermail/dovecot-news/2020-February/000429.html
Fixed in dovecot-2.3.9.3-1.mga8 by Stig-Ørjan.
Resolution: (none) => FIXEDStatus: NEW => RESOLVED
Fedora has issued advisories for this today (February 20): https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/NJXHOUT3FH2DJNMACSX4GHPP4MUV4UKA/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/6XYT55WH372BJOXCJRKBDIFGBMPVOIDT/ The updated from 2.3.4 and 2.3.7, even though those supposedly aren't vulnerable, but don't give bug links that might say whether the older versions are vulnerable (the upstream advisories just say 2.3.9 is). Will reopen if other distros do it.