{"action":"Upgrade thunderbird to 1:140.12.0esr-1~deb12u1 or later.","affected":[{"fixed":"1:140.12.0esr-1~deb12u1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["1:140.12.0esr-1~deb12u1"],"id":"tcs_01M5NQDSVC5MMM1CM3APSZJ6YV","modified_at":"2026-10-01T03:02:02.869207961Z","published_at":"2026-06-16T13:16:29.643Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-12294","https://security-tracker.debian.org/tracker/CVE-2026-12294"],"severity":{"label":"critical","score":9.6},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-12294#Debian:12/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-12294"}],"summary":"Sandbox escape in the DOM: Workers component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12."}