{"action":"Upgrade firefox-esr to 153.4.0esr-1 or later.","affected":[{"fixed":"153.4.0esr-1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["153.4.0esr-1"],"id":"tcs_01M5NPHVB3VB4QTTN1GX3VDVCY","modified_at":"2026-10-06T16:01:37.837484433Z","published_at":"2026-09-29T13:17:47.037Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-100818","https://security-tracker.debian.org/tracker/CVE-2026-100818"],"severity":{"label":"critical","score":9.6},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-100818#Debian:14/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-100818"}],"summary":"Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox E"}