CVE-2020-15669
When aborting an operation, such as a fetch, an abort signal may be deleted while alerting the objects to be notified. This results in a use-after-free and we presume that with enough effort it could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.12 and Thunderbird < 68.12. Date published : 2020-10-01 https://bugzilla.mozilla.org/show_bug.cgi?id=1656957