{"action":"Upgrade thunderbird to 1:153.5.0esr-1 or later.","affected":[{"fixed":"1:153.5.0esr-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1:153.5.0esr-1"],"id":"tcs_01M5NPX29EV6RN0JAC48166WQM","modified_at":"2026-10-21T06:04:23.985522713Z","published_at":"2026-10-13T13:17:22.280Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-109718","https://security-tracker.debian.org/tracker/CVE-2026-109718"],"severity":{"label":"medium","score":5.4},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-109718#Debian:14/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-109718"}],"summary":"Use-after-free in the XML component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5."}