For a list of 2.8-stable packages errata, click here.
For a list of 2.9-stable packages errata, click here.
For a list of 3.0-stable packages errata, click here.
For a list of 3.1-stable packages errata, click here.
For a list of 3.2-stable packages errata, click here.
For a list of 3.3-stable packages errata, click here.
For a list of 3.4-stable packages errata, click here.
For a list of 3.5-stable packages errata, click here.
For a list of 3.6-stable packages errata, click here.
For a list of 3.7-stable packages errata, click here.
For a list of 3.8-stable packages errata, click here.
For a list of 3.9-stable packages errata, click here.

This is an abbreviated change list for OpenBSD 4.0-stable packages:

asterisk-1.2.9.1p1.tgz i386 amd64

Security fix

clamav-0.88.5.tgz i386 amd64

Security fix

fire-1.0p0.tgz i386 amd64

Security fix

firefox-i18n-en-GB-1.5.0.7.tgz i386 amd64

all language packs

horde-3.0.12.tgz i386 amd64

Security fix

moodle-1.6.3-mysql.tgz i386 amd64

Security fix

moodle-1.6.3-pgsql.tgz i386 amd64

Security fix

moodle-1.6.3.tgz i386 amd64

Security fix

mozilla-firefox-1.5.0.7.tgz i386 amd64

Security fix

mozilla-thunderbird-1.5.0.7.tgz i386 amd64

Security fix

mysql-client-5.0.24a.tgz i386 amd64

Security fix

mysql-server-5.0.24a.tgz i386 amd64

Security fix

mysql-tests-5.0.24a.tgz i386 amd64

Security fix

net-snmp-5.1.3p4.tgz i386 amd64

Bugfix

postgresql-client-8.1.5.tgz i386 amd64

Security fix

postgresql-docs-8.1.5.tgz i386 amd64

Security fix

postgresql-server-8.1.5.tgz i386 amd64

Security fix

qt3-mt-3.5p8.tgz i386 amd64

Security fix

ruby-1.8.4p5.tgz i386 amd64

Security fix

screen-4.0.3-shm.tgz i386 amd64

Security fix

screen-4.0.3-static.tgz i386 amd64

Security fix

screen-4.0.3.tgz i386 amd64

Security fix

thunderbird-i18n-en-GB-1.5.0.7.tgz i386 amd64

all language packs

xine-lib-1.1.2.tgz i386 amd64

Security fix

xoops-2.0.15.tgz i386 amd64

Security fix