{"action":"Upgrade thunderbird to 1:153.5.1esr-1~deb12u1 or later.","affected":[{"fixed":"1:153.5.1esr-1~deb12u1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["1:153.5.1esr-1~deb12u1"],"id":"tcs_01M5NPX4G7E2F4QVR3AGZMSK9S","modified_at":"2026-10-26T20:00:11.266053401Z","published_at":"2026-10-13T13:17:22.590Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-109721","https://security-tracker.debian.org/tracker/CVE-2026-109721"],"severity":{"label":"medium","score":5.4},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-109721#Debian:12/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-109721"}],"summary":"Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5."}