{"action":"Upgrade thunderbird to 1:140.14.0esr-1~deb13u1 or later.","affected":[{"fixed":"1:140.14.0esr-1~deb13u1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["1:140.14.0esr-1~deb13u1"],"id":"tcs_01M5NVBCMFTPQEPP3Y4CDWHTNR","modified_at":"2026-10-01T03:03:49.933151068Z","published_at":"2026-08-18T13:17:29.850Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-74936","https://security-tracker.debian.org/tracker/CVE-2026-74936"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-74936#Debian:13/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-74936"}],"summary":"Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1."}