The Array.prototype.concat implementation in builtins.cc in Google V8, as used in Google Chrome before 49.0.2623.108, does not properly consider element data types, which allows remote attackers to cause a denial of service (out-of-bounds read) or possibly have unspecified other impact via crafted JavaScript code.
https://security.gentoo.org/glsa/201605-02
https://codereview.chromium.org/1804963002/
http://www.ubuntu.com/usn/USN-2955-1
http://www.debian.org/security/2016/dsa-3531
http://rhn.redhat.com/errata/RHSA-2016-0525.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00039.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00000.html
http://googlechromereleases.blogspot.com/2016/03/stable-channel-update_24.html