Buffer overflow in the JS API in the PDF functionality in Google Chrome before 20.0.1132.43 allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15584
http://googlechromereleases.blogspot.com/2012/06/stable-channel-update_26.html