Security researcher Daniele Di Proietto discovered that when WebGL content crafted in a specific manner wrote strings, it would cause a crash when this content was run. External Reference: https://www.mozilla.org/en-US/security/advisories/mfsa2015-14 Acknowledgements: Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Daniele Di Proietto as the original reporter. Statement: This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5, 6 and 7.