{"action":"Upgrade firefox-esr to 140.12.0esr-1~deb12u1 or later.","affected":[{"fixed":"140.12.0esr-1~deb12u1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["140.12.0esr-1~deb12u1"],"id":"tcs_01M5NQDRDPTN7ZEJ46KD8ETWBV","modified_at":"2026-10-27T09:47:32.197416710Z","published_at":"2026-06-16T13:16:29.363Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-12291","https://security-tracker.debian.org/tracker/CVE-2026-12291"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-12291","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-12291"}],"summary":"Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12."}