{"schema":"threatline.record/2","record":{"id":"CVE-2026-100818","aliases":[],"summary":"Sandbox escape due to use-after-free in the Widget: Gtk component","details":"Sandbox escape due to use-after-free in the Widget: Gtk 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.","categories":["Unclassified"],"product":"Thunderbird","vendor":"Mozilla","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100818","source_modified_at":"2026-09-30T17:20:46.498Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Thunderbird","vendor":"Mozilla","versions":[{"status":"unaffected","version":"140.17","lessThanOrEqual":"140.*","versionType":"rpm"},{"status":"unaffected","version":"153.4","lessThanOrEqual":"153.*","versionType":"rpm"},{"status":"unaffected","version":"157","lessThanOrEqual":"*","versionType":"rpm"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100818","source_modified_at":"2026-09-30T17:20:46.498Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Firefox","vendor":"Mozilla","versions":[{"status":"unaffected","version":"140.17","lessThanOrEqual":"140.*","versionType":"rpm"},{"status":"unaffected","version":"153.4","lessThanOrEqual":"153.*","versionType":"rpm"},{"status":"unaffected","version":"157","lessThanOrEqual":"*","versionType":"rpm"}],"defaultStatus":null}],"fixed_versions":[],"cvss":9.6,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.0026,"percentile":0.16706,"score_date":"2026-10-23"},"published_at":"2026-09-29T12:36:28.602Z","modified_at":"2026-09-30T17:20:46.498Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-100818","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-30T17:20:46.498Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-100818","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2069399"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2026-100/"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2026-101/"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2026-102/"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2026-103/"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2026-97/"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2026-99/"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-09-29T13:13:15.417892Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-30T17:20:46.498Z","content_hash":"23edfbdaadc17bf1258203bbe3fb82afb0f86de560554ab3fa55d18266dc08b9"}}