{"action":"Upgrade firefox-esr to 140.12.0esr-1~deb13u1 or later.","affected":[{"fixed":"140.12.0esr-1~deb13u1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["140.12.0esr-1~deb13u1"],"id":"tcs_01M5NQDWS0CX3DBMAZ20QZGJGS","modified_at":"2026-10-01T03:02:22.691577836Z","published_at":"2026-06-16T13:16:30.147Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-12299","https://security-tracker.debian.org/tracker/CVE-2026-12299"],"severity":{"label":"medium","score":5.4},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-12299#Debian:13/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-12299"}],"summary":"JIT miscompilation in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12."}