CVE 2010-0847
Unspecified vulnerability in the Java 2D component in Oracle Java SE and Java for Business 6 Update 18, 5.0 Update 23, 1.4.2_25, and 1.3.1_27 allows remote attackers to affect confidentiality, integrity, and availability via unknown vectors. NOTE: the previous information was obtained from the March 2010 CPU. Oracle has not commented on claims from a reliable researcher that this is a heap-based buffer overflow that allows arbitrary code execution via a crafted image.
See the 
CVE page on Mitre.org
for more details.
