{"action":"Upgrade firefox-esr to 153.5.0esr-1 or later.","affected":[{"fixed":"153.5.0esr-1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["153.5.0esr-1"],"id":"tcs_01M5NPX4CJ9SCM3A7YH6SDBVPN","modified_at":"2026-10-23T18:05:10.150312165Z","published_at":"2026-10-13T13:17:22.590Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-109721","https://security-tracker.debian.org/tracker/CVE-2026-109721"],"severity":{"label":"medium","score":5.4},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-109721#Debian:14/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-109721"}],"summary":"Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5."}