{"action":"Upgrade thunderbird to 1:140.15.0esr-1~deb13u1 or later.","affected":[{"fixed":"1:140.15.0esr-1~deb13u1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["1:140.15.0esr-1~deb13u1"],"id":"tcs_01M5NVXP43F91PMVMB1JQAPRA0","modified_at":"2026-10-06T16:02:24.647533407Z","published_at":"2026-09-01T13:20:05.933Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-84121","https://security-tracker.debian.org/tracker/CVE-2026-84121"],"severity":{"label":"critical","score":9.6},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-84121#Debian:13/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-84121"}],"summary":"Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbir"}