OpenSMTPD -- multiple vulnerabilities

OpenSMTPD developers report:

an oversight in the portable version of fgetln() that allows
attackers to read and write out-of-bounds memory
multiple denial-of-service vulnerabilities that allow local users
to kill or hang OpenSMTPD
a stack-based buffer overflow that allows local users to crash
OpenSMTPD, or execute arbitrary code as the non-chrooted _smtpd
user
a hardlink attack (or race-conditioned symlink attack) that allows
local users to unset the chflags() of arbitrary files
a hardlink attack that allows local users to read the first line of
arbitrary files (for example, root’s hash from /etc/master.passwd)

a denial-of-service vulnerability that allows remote attackers to
fill OpenSMTPD’s queue or mailbox hard-disk partition
an out-of-bounds memory read that allows remote attackers to crash
OpenSMTPD, or leak information and defeat the ASLR protection
a use-after-free vulnerability that allows remote attackers to
crash OpenSMTPD, or execute arbitrary code as the non-chrooted
_smtpd user