Oracle JRE Cryptographic Issues Vulnerability - CVE-2012-2739
Oracle Java SE before 7 Update 6 and OpenJDK 7 before 7u6 build 12 and 8 before build 39 computes hash values without restricting the ability to trigger hash collisions predictably which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.