A flaw was found in the way the Hotspot JVM handled default methods when performing private method resolution. An untrusted Java application or applet could use this flaw to bypass certain Java sandbox restrictions.
Public now via Oracle Critical Patch Update - April 2015. Fixed in Oracle Java SE 8u45. External References: http://www.oracle.com/technetwork/topics/security/cpuapr2015-2365600.html#AppendixJAVA
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 6 Via RHSA-2015:0809 https://rhn.redhat.com/errata/RHSA-2015-0809.html
Upstream OpenJDK commit: http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/rev/02e2c04a3289
This issue has been addressed in the following products: Oracle Java for Red Hat Enterprise Linux 7 Oracle Java for Red Hat Enterprise Linux 6 Via RHSA-2015:0854 https://rhn.redhat.com/errata/RHSA-2015-0854.html