{"action":"Upgrade firefox-esr to 45.9.0esr-1 or later.","affected":[{"fixed":"45.9.0esr-1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["45.9.0esr-1"],"id":"tcs_01M5NCEJP2YPJBFMNHF4J0MBF6","modified_at":"2026-09-01T20:03:48.224998297Z","published_at":"2018-06-11T21:29:05.937Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2017-5439","https://security-tracker.debian.org/tracker/CVE-2017-5439"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2017-5439","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2017-5439"}],"summary":"A use-after-free vulnerability during XSLT processing due to poor handling of template parameters. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.1, Firef"}