Security researcher Martin Barbella reported that under certain conditions, viewing a XUL document while JavaScript caused deleted memory to be accessed. This flaw could potentially be used by an attacker to crash a victim's browser and run arbitrary code on their computer.
Public now via: [1] http://www.mozilla.org/security/announce/2011/mfsa2011-20.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Red Hat Enterprise Linux 5 Via RHSA-2011:0887 https://rhn.redhat.com/errata/RHSA-2011-0887.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Via RHSA-2011:0888 https://rhn.redhat.com/errata/RHSA-2011-0888.html
This issue has been addressed in following products: Red Hat Enterprise Linux 5 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 4 Via RHSA-2011:0885 https://rhn.redhat.com/errata/RHSA-2011-0885.html