A use-after-free vulnerability can occur during XSL transformations when the source document for the transformation is manipulated by script content during the transformation. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.6, Firefox ESR < 52.6, and Firefox < 58.
www.securityfocus.com/bid/102783
www.securitytracker.com/id/1040270
access.redhat.com/errata/RHSA-2018:0122
access.redhat.com/errata/RHSA-2018:0262
bugzilla.mozilla.org/show_bug.cgi?id=1387427
lists.debian.org/debian-lts-announce/2018/01/msg00030.html
lists.debian.org/debian-lts-announce/2018/01/msg00036.html
usn.ubuntu.com/3544-1/
www.debian.org/security/2018/dsa-4096
www.debian.org/security/2018/dsa-4102
www.mozilla.org/security/advisories/mfsa2018-02/
www.mozilla.org/security/advisories/mfsa2018-03/
www.mozilla.org/security/advisories/mfsa2018-04/