The Regular Expressions package in International Components for Unicode (ICU) 52 before SVN revision 292944, as used in Google Chrome before 40.0.2214.91, allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via vectors related to a zero-length quantifier.
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
https://security.gentoo.org/glsa/201503-06
https://codereview.chromium.org/726973003
https://code.google.com/p/chromium/issues/detail?id=422824
https://chromium.googlesource.com/chromium/deps/icu52/+/6242e2fbb36f486f2c0addd1c3cef67fc4ed33fb
https://chromium.googlesource.com/chromium/deps/icu52/+/3af4ce5982311035e5f36803d547c0befa576c8c
http://www.ubuntu.com/usn/USN-2476-1
http://www.securitytracker.com/id/1031623
http://www.securityfocus.com/bid/72288
http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
http://security.gentoo.org/glsa/glsa-201502-13.xml
http://secunia.com/advisories/62665
http://secunia.com/advisories/62575
http://secunia.com/advisories/62383
http://rhn.redhat.com/errata/RHSA-2015-0093.html
http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00005.html
http://googlechromereleases.blogspot.com/2015/01/stable-update.html