{"action":"Upgrade thunderbird to 1:140.15.0esr-1~deb12u1 or later.","affected":[{"fixed":"1:140.15.0esr-1~deb12u1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["1:140.15.0esr-1~deb12u1"],"id":"tcs_01M5NVYR2VMQ3741M85R7BJQEE","modified_at":"2026-10-06T16:02:24.502396299Z","published_at":"2026-09-01T22:17:19.700Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-84639","https://security-tracker.debian.org/tracker/CVE-2026-84639"],"severity":{"label":"critical","score":9.1},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-84639","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-84639"}],"summary":"Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2."}