Use-after-free vulnerability in the CPDFSDK_PageView implementation in fpdfsdk/src/fsdk_mgr.cpp in PDFium, as used in Google Chrome before 46.0.2490.71, allows remote attackers to cause a denial of service (heap memory corruption) or possibly have unspecified other impact by leveraging mishandling of a focused annotation in a PDF document.
https://security.gentoo.org/glsa/201603-09
https://codereview.chromium.org/1332653002
https://code.google.com/p/chromium/issues/detail?id=507316
http://www.securitytracker.com/id/1033816
http://www.securityfocus.com/bid/77071
http://www.debian.org/security/2015/dsa-3376
http://rhn.redhat.com/errata/RHSA-2015-1912.html
http://googlechromereleases.blogspot.com/2015/10/stable-channel-update.html