{"action":"Upgrade thunderbird to 1:153.2.0esr-1 or later.","affected":[{"fixed":"1:153.2.0esr-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1:153.2.0esr-1"],"id":"tcs_01M5NVYRMDVESH81B3RD5CJ9JA","modified_at":"2026-10-06T16:01:44.014025795Z","published_at":"2026-09-01T22:17:19.800Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-84640","https://security-tracker.debian.org/tracker/CVE-2026-84640"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-84640#Debian:14/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-84640"}],"summary":"A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2."}