{"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_01M5NPY1PHEZC56MGHE2T688FN","modified_at":"2026-10-26T20:00:13.723557511Z","published_at":"2026-10-13T13:17:26.740Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-109759","https://security-tracker.debian.org/tracker/CVE-2026-109759"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-109759#Debian:13/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-109759"}],"summary":"Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5."}