{"action":"Upgrade firefox-esr to 115.6.0esr-1~deb12u1 or later.","affected":[{"fixed":"115.6.0esr-1~deb12u1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["115.6.0esr-1~deb12u1"],"id":"tcs_01M5NJZSSTW7F9DYJX0B2Q18WZ","modified_at":"2026-10-26T18:02:21.250427332Z","published_at":"2023-12-19T14:15:07.650Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2023-6863","https://security-tracker.debian.org/tracker/CVE-2023-6863"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2023-6863","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2023-6863"}],"summary":"The `ShutdownObserver()` was susceptible to potentially undefined behavior due to its reliance on a dynamic type that lacked a virtual destructor. This vulnerability affects Firefox ESR < 115.6, Thund"}