{"schema":"threatline.record/2","record":{"id":"CVE-2019-17026","aliases":[],"summary":"Mozilla Firefox And Thunderbird Type Confusion Vulnerability","details":"Mozilla Firefox and Thunderbird contain a type confusion vulnerability due to incorrect alias information in the IonMonkey JIT compiler when setting array elements.","categories":["Applications & CMS"],"product":"Firefox and Thunderbird","vendor":"Mozilla","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2019-17026","source_modified_at":"2025-10-21T23:35:50.362Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Firefox ESR","vendor":"Mozilla","versions":[{"lessThan":"68.4.1","status":"affected","version":"unspecified","versionType":"custom"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2019-17026","source_modified_at":"2025-10-21T23:35:50.362Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThan":"68.4.1","status":"affected","version":"unspecified","versionType":"custom"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2019-17026","source_modified_at":"2025-10-21T23:35:50.362Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Firefox","vendor":"Mozilla","versions":[{"lessThan":"72.0.1","status":"affected","version":"unspecified","versionType":"custom"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2019-17026","source_modified_at":"2025-10-21T23:35:50.362Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Firefox ESR","ecosystem":null},"version":"68.4.1","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2019-17026","source_modified_at":"2025-10-21T23:35:50.362Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Thunderbird","ecosystem":null},"version":"68.4.1","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2019-17026","source_modified_at":"2025-10-21T23:35:50.362Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Firefox","ecosystem":null},"version":"72.0.1","basis":"first unaffected version stated in the CVE record"}],"cvss":8.8,"severity":"High","kev":{"listed":true,"date_added":"2021-11-03","due_date":"2022-05-03","required_action":"Apply updates per vendor instructions.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.46311,"percentile":0.98816,"score_date":"2026-10-23"},"published_at":"2020-03-02T04:05:03.000Z","modified_at":"2025-10-21T23:35:50.362Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2019-17026","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:35:50.362Z"},{"source":"Exploit-DB","url":"https://www.exploit-db.com/exploits/49864","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2021-05-13"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2019-17026","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","Exploit-DB","EPSS"],"references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-17026","source":"CISA KEV"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2020-04/","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2020-03/","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1607443","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://security.gentoo.org/glsa/202003-02","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred"]},{"source":"CVE List","url":"https://usn.ubuntu.com/4335-1/","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-17026","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"active","automatable":"no","technical_impact":"total","assessed_at":"2025-02-07T12:48:51.769583Z"},"exploits":[{"source":"Exploit-DB","kind":"Local exploit","name":"Firefox 72 IonMonkey - JIT Type Confusion","url":"https://www.exploit-db.com/exploits/49864","date":"2021-05-13","added":"2021-05-13","verified":false}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2025-10-21T23:35:50.362Z","content_hash":"0b7c22aaa6fe3b55b25cd4ae6f73020163f696f8dd08c24af865b40bd568f533"}}