{"action":"Upgrade thunderbird to 1:140.12.0esr-1 or later.","affected":[{"fixed":"1:140.12.0esr-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1:140.12.0esr-1"],"id":"tcs_01M5NQDX4NVCQCEC1DTACVHDFT","modified_at":"2026-10-01T03:02:22.691577836Z","published_at":"2026-06-16T13:16:30.147Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-12299","https://security-tracker.debian.org/tracker/CVE-2026-12299"],"severity":{"label":"medium","score":5.4},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-12299#Debian:14/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-12299"}],"summary":"JIT miscompilation in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12."}