Security researcher Looben Yang discovered a use-after-free vulnerability when recursively calling .open() on an XMLHttpRequest in a SharedWorker.
Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Looben Yang as the original reporter.
This issue has been addressed in the following products:
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Via RHSA-2015:1586 https://rhn.redhat.com/errata/RHSA-2015-1586.html