{"action":"Upgrade firefox-esr to 153.4.0esr-1~deb12u1 or later.","affected":[{"fixed":"153.4.0esr-1~deb12u1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["153.4.0esr-1~deb12u1"],"id":"tcs_01M5NPHVT3DTM5YFMKASQ29TPE","modified_at":"2026-10-06T16:01:33.372651794Z","published_at":"2026-09-29T13:17:47.193Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-100819","https://security-tracker.debian.org/tracker/CVE-2026-100819"],"severity":{"label":"critical","score":9.6},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-100819","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-100819"}],"summary":"Sandbox escape due to incorrect boundary conditions in the XPCOM component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Fire"}