Mozilla Firefox before 43.0 stores cookies containing vertical tab characters, which allows remote attackers to obtain sensitive information by reading HTTP Cookie headers.
https://security.gentoo.org/glsa/201512-10
https://bugzilla.mozilla.org/show_bug.cgi?id=1191423
http://www.ubuntu.com/usn/USN-2833-1
http://www.securitytracker.com/id/1034825
http://www.securitytracker.com/id/1034426
http://www.securityfocus.com/bid/79280
http://www.mozilla.org/security/announce/2016/mfsa2016-04.html
http://www.mozilla.org/security/announce/2015/mfsa2015-137.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00008.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00007.html
http://lists.opensuse.org/opensuse-updates/2015-12/msg00104.html
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00001.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174253.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174083.html