Unspecified vulnerability in Opera before 10.10 has unknown impact and attack vectors, related to a "moderately severe issue."
http://secunia.com/advisories/37469
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6543
http://www.opera.com/docs/changelogs/mac/1010/
http://www.opera.com/docs/changelogs/unix/1010/