{"id":"CVE-2020-26950","details":"In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox \u003c 82.0.3, Firefox ESR \u003c 78.4.1, and Thunderbird \u003c 78.4.2.","modified":"2026-03-13T00:37:59.266209Z","published":"2020-12-09T01:15:12.503Z","related":["MGASA-2020-0421","SUSE-SU-2020:14542-1","SUSE-SU-2020:3311-1","SUSE-SU-2020:3312-1","SUSE-SU-2020:3331-1","SUSE-SU-2020:3418-1","openSUSE-SU-2020:1909-1","openSUSE-SU-2020:1919-1","openSUSE-SU-2020:2022-1","openSUSE-SU-2020:2133-1","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/mfsa2020-49/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1675905"},{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"82.0.3"}]},{"events":[{"introduced":"0"},{"fixed":"78.4.1"}]},{"events":[{"introduced":"0"},{"fixed":"78.4.2"}]}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-26950.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"}]}