March 9, 2010 Opera confirms " highly critical" browser bug in "Windows Versions of Opera 10 and 10.5. According to "Scunins Report" theoretically the flaw could be used to corrupt memory, crash Opera and execute attack code. In an 64 environment the bug would crash Opera, in a 32 , memory could be moved around short distances and theoretically execute attack code. Opera is working on an update that will patch the weakness and should be coming out soon. In the mean time, the best way to defend your computer is to make sure "DEP" and "ASLR" are enabled.