{"action":"Upgrade thunderbird to 1:140.17.0esr-1~deb12u1 or later.","affected":[{"fixed":"1:140.17.0esr-1~deb12u1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["1:140.17.0esr-1~deb12u1"],"id":"tcs_01M5NPH61V9FQKZPXRE8JBJ2YY","modified_at":"2026-10-07T09:47:29.920376856Z","published_at":"2026-09-29T13:17:42.210Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-100776","https://security-tracker.debian.org/tracker/CVE-2026-100776"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-100776#Debian:12/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-100776"}],"summary":"Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17."}