{"action":"Upgrade firefox-esr to 140.9.0esr-1 or later.","affected":[{"fixed":"140.9.0esr-1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["140.9.0esr-1"],"id":"tcs_01M5NSEXFGEF7P73RGKNS9PDMS","modified_at":"2026-10-01T03:02:34.392096215Z","published_at":"2026-03-24T13:16:04.737Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-4689","https://security-tracker.debian.org/tracker/CVE-2026-4689"],"severity":{"label":"critical","score":10},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-4689#Debian:14/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-4689"}],"summary":"Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and T"}