Security researcher shutdown reported that data from other domains could be read when RegExp.input was set.
This is now public: http://www.mozilla.org/security/announce/2011/mfsa2011-30.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Red Hat Enterprise Linux 5 Via RHSA-2011:1165 https://rhn.redhat.com/errata/RHSA-2011-1165.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Via RHSA-2011:1167 https://rhn.redhat.com/errata/RHSA-2011-1167.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Red Hat Enterprise Linux 5 Red Hat Enterprise Linux 6 Via RHSA-2011:1164 https://rhn.redhat.com/errata/RHSA-2011-1164.html