Firefox is vulnerable to buffer overflow attacks. This occurs during UTF-8 to Unicode string conversion within JavaScript with extremely large amounts of data which leads application to crash.
www.securityfocus.com/bid/104138
www.securitytracker.com/id/1040898
access.redhat.com/errata/RHSA-2018:1414
access.redhat.com/errata/RHSA-2018:1415
access.redhat.com/errata/RHSA-2018:1725
access.redhat.com/errata/RHSA-2018:1726
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/show_bug.cgi?id=1443891
lists.debian.org/debian-lts-announce/2018/05/msg00007.html
lists.debian.org/debian-lts-announce/2018/05/msg00013.html
security.gentoo.org/glsa/201810-01
security.gentoo.org/glsa/201811-13
usn.ubuntu.com/3660-1/
www.debian.org/security/2018/dsa-4199
www.debian.org/security/2018/dsa-4209
www.mozilla.org/en-US/security/advisories/mfsa2018-11/
www.mozilla.org/security/advisories/mfsa2018-12/
www.mozilla.org/security/advisories/mfsa2018-13/