{"action":"Upgrade thunderbird to 1:78.4.2-1 or later.","affected":[{"fixed":"1:78.4.2-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1:78.4.2-1"],"id":"tcs_01M5NEXH47J5F5D6AV331JDW90","modified_at":"2026-09-11T11:02:31.235472622Z","published_at":"2020-12-09T01:15:12.503Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2020-26950","https://security-tracker.debian.org/tracker/CVE-2020-26950"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2020-26950#Debian:14/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2020-26950"}],"summary":"In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox E"}