In Percona Server security fix releases I mentioned patches for MySQL 4.0 and 4.1.
I am happy to announce that GoDaddy.com released patches for MySQL 4.0 and MySQL 4.1 under GPL license and you can get them from our Launchpad:
for 4.0: lp:~percona-dev/percona-patches/4.0.30 ( or https://launchpad.net/~percona-dev/percona-patches/4.0.30 )
for 4.1: lp:~percona-dev/percona-patches/4.1.24 ( or https://launchpad.net/~percona-dev/percona-patches/4.1.24)
If you are using MySQL 4.0 and 4.1 with public user access we strongly recommend to patch your MySQL instances. You need help with binaries you may contact us or wait until we have binaries public available.