WebM libvpx (aka the VP8 Codec SDK) before 0.9.5, as used in Google Chrome before 7.0.517.44, allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via invalid frames.
https://rhn.redhat.com/errata/RHSA-2010-0999.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12198
http://www.vupen.com/english/advisories/2011/0115
http://security.gentoo.org/glsa/glsa-201101-03.xml
http://secunia.com/advisories/42109
http://review.webmproject.org/gitweb?p=libvpx.git%3Ba=blob%3Bf=CHANGELOG
http://googlechromereleases.blogspot.com/2010/11/stable-channel-update.html