The implementation of the Unicode Bidirectional Algorithm (aka Bidi algorithm or UBA) in Google Chrome before 5.0.375.99 allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via unknown vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11900
http://www.vupen.com/english/advisories/2011/0552
http://www.vupen.com/english/advisories/2010/2722
http://www.ubuntu.com/usn/USN-1006-1
http://www.mandriva.com/security/advisories?name=MDVSA-2011:039
http://secunia.com/advisories/41856
http://lists.opensuse.org/opensuse-security-announce/2010-10/msg00000.html
http://googlechromereleases.blogspot.com/2010/07/stable-channel-update.html