{"action":"Upgrade thunderbird to 1:128.6.0esr-1~deb12u1 or later.","affected":[{"fixed":"1:128.6.0esr-1~deb12u1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["1:128.6.0esr-1~deb12u1"],"id":"tcs_01M5NMSFB3K7H9WYEXGYJY0HM7","modified_at":"2026-10-06T09:47:37.162587709Z","published_at":"2025-01-07T16:15:38.563Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2025-0239","https://security-tracker.debian.org/tracker/CVE-2025-0239"],"severity":{"label":"medium","score":4},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2025-0239#Debian:12/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2025-0239"}],"summary":"When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird"}