The "send page" function can overrun the heap on very long links. With compelling content that people will want to forward to all their friends and the right link this could be used to execute arbitrary code. See http://www.mozilla.org/projects/security/known-vulnerabilities.html#mozilla1.7.3 for more information.
This issue is going to be RHSA-2004:486.
Created attachment 104192 [details] Final patch for this issue.
An errata has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2004-486.html