{"action":"Upgrade thunderbird to 1:140.17.0esr-1~deb12u1 or later.","affected":[{"fixed":"1:140.17.0esr-1~deb12u1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["1:140.17.0esr-1~deb12u1"],"id":"tcs_01M5NPGZJ7F7QNF9ZM2FY2RVGX","modified_at":"2026-10-14T09:47:46.087623358Z","published_at":"2026-09-29T13:17:40.837Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-100766","https://security-tracker.debian.org/tracker/CVE-2026-100766"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-100766#Debian:12/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-100766"}],"summary":"Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and"}