{"id":"CVE-2020-26959","details":"During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox \u003c 83, Firefox ESR \u003c 78.5, and Thunderbird \u003c 78.5.","modified":"2026-03-15T22:35:26.802748Z","published":"2020-12-09T01:15:13.143Z","related":["MGASA-2020-0427","MGASA-2020-0433","SUSE-SU-2020:14548-1","SUSE-SU-2020:3383-1","SUSE-SU-2020:3458-1","SUSE-SU-2020:3528-1","SUSE-SU-2020:3548-1","openSUSE-SU-2020:2020-1","openSUSE-SU-2020:2031-1","openSUSE-SU-2020:2096-1","openSUSE-SU-2020:2187-1","openSUSE-SU-2020:2315-1","openSUSE-SU-2024:10600-1","openSUSE-SU-2024:10601-1","openSUSE-SU-2024:14572-1"],"references":[{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-51/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-52/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-50/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1669466"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"83.0"}]},{"events":[{"introduced":"0"},{"fixed":"78.5"}]},{"events":[{"introduced":"0"},{"fixed":"78.5"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26959.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}