{"action":"Upgrade thunderbird to 1:140.8.0esr-1~deb12u1 or later.","affected":[{"fixed":"1:140.8.0esr-1~deb12u1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["1:140.8.0esr-1~deb12u1"],"id":"tcs_01M5NRFMHR41EZ63G8KXP2C0TP","modified_at":"2026-10-01T03:03:21.519166852Z","published_at":"2026-02-24T14:16:26.230Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-2778","https://security-tracker.debian.org/tracker/CVE-2026-2778"],"severity":{"label":"critical","score":10},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-2778#Debian:12/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-2778"}],"summary":"Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderb"}