{"action":"Upgrade firefox-esr to 153.4.0esr-1~deb13u1 or later.","affected":[{"fixed":"153.4.0esr-1~deb13u1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["153.4.0esr-1~deb13u1"],"id":"tcs_01M5NPHSWTRXMPR6CKJ7MKTFAS","modified_at":"2026-10-06T16:01:33.305824823Z","published_at":"2026-09-29T13:17:46.650Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-100815","https://security-tracker.debian.org/tracker/CVE-2026-100815"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-100815#Debian:13/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-100815"}],"summary":"Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157."}