In January 2007 a flaw was found affecting the SUN JRE; "Buffer overflow in Sun
JDK and Java Runtime Environment (JRE) 5.0 Update 9 and earlier, SDK and JRE
1.4.2_12 and earlier, and SDK and JRE 1.3.1_18 and earlier allows applets to
gain privileges via a GIF image with a block with a 0 width field, which
triggers memory corruption."
The list of fixed products with their respective errata is here: