When using nested workers, a use-after-free could occur during worker destruction. This resulted in a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.Referenceshttps://bugzilla.mozilla.org/show_bug.cgi?id=1546331https://www.mozilla.org/security/advisories/mfsa2019-36/https://www.mozilla.org/security/advisories/mfsa2019-38/https://www.mozilla.org/security/advisories/mfsa2019-37/http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00000.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-01/msg00001.htmlhttps://usn.ubuntu.com/4241-1/https://access.redhat.com/errata/RHSA-2020:0292https://access.redhat.com/errata/RHSA-2020:0295https://security.gentoo.org/glsa/202003-02https://security.gentoo.org/glsa/202003-10https://usn.ubuntu.com/4335-1/
