{"action":"Upgrade firefox-esr to 153.5.0esr-1~deb13u1 or later.","affected":[{"fixed":"153.5.0esr-1~deb13u1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["153.5.0esr-1~deb13u1"],"id":"tcs_01M5NPWSW5KPN1VGWBMBMSJZEY","modified_at":"2026-10-28T09:47:51.132478255Z","published_at":"2026-10-13T13:17:20.803Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-109707","https://security-tracker.debian.org/tracker/CVE-2026-109707"],"severity":{"label":"critical","score":9.6},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-109707#Debian:13/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-109707"}],"summary":"Sandbox escape due to use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44."}