Shortly after releasing 4.2.7.Final, a regression was found (caused in 4.2.6.Final) that may affect some usages of Date, Calendar-as-a-Date, and JDBC Dates. See https://hibernate.atlassian.net/browse/HHH-8617 for more information. So, we decided to release 4.2.7.SP1 to correct it.
JBoss Nexus: https://repository.jboss.org/nexus/content/groups/public/org/hibernate
Maven Central: http://repo1.maven.org/maven2/org/hibernate/hibernate-core (should update in a couple of days)
Downloads: 4.2.7.SP1 ZIP, 4.2.7.SP1 TGZ