A use-after-free vulnerability can occur when script uses mutation events to move DOM nodes between documents, resulting in the old document that held the node being freed but the node still having a pointer referencing it. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.
https://www.mozilla.org/security/advisories/mfsa2018-19/
https://www.mozilla.org/security/advisories/mfsa2018-18/
https://www.mozilla.org/security/advisories/mfsa2018-17/
https://www.mozilla.org/security/advisories/mfsa2018-16/
https://www.mozilla.org/security/advisories/mfsa2018-15/
https://www.debian.org/security/2018/dsa-4244
https://www.debian.org/security/2018/dsa-4235
https://usn.ubuntu.com/3714-1/
https://usn.ubuntu.com/3705-1/
https://security.gentoo.org/glsa/201811-13
https://security.gentoo.org/glsa/201810-01
https://lists.debian.org/debian-lts-announce/2018/07/msg00013.html
https://lists.debian.org/debian-lts-announce/2018/06/msg00014.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1464784
https://access.redhat.com/errata/RHSA-2018:2252
https://access.redhat.com/errata/RHSA-2018:2251
https://access.redhat.com/errata/RHSA-2018:2113
https://access.redhat.com/errata/RHSA-2018:2112