Based on MySQL 5.5.44, including all the bug fixes in it, Percona Server 5.5.44-37.3 is now the current stable release in the 5.5 series. All of Percona‘s software is open-source and free, all the details of the release can be found in the 5.5.44-37.3 milestone at Launchpad.
libmysqlclientlibraries were missing on CentOS 6. Bug fixed #1408500.
opensslpackage (1.0.1e-30.el6_6.9), containing a fix for CVE-2015-4000, changed the DH key sizes to a minimum of 768 bits. This caused an issue for MySQL as it uses 512 bit keys. Fixed by backporting an upstream 5.7 fix that increases the key size to 2048 bits. Bug fixed #1462856 (upstream #77275).
max_slowlog_size, the slow query log was rotated every time
slow_query_logwas enabled, not really checking if the current slow log is indeed bigger than
max_slowlog_sizeor not. Bug fixed #1416582.
Prepared XA transactions with update undo logs were not properly recovered. Bug fixed #1468301.
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