{"cve":"CVE-2019-17026","nvd":{"published":"2020-03-02T05:15:12.010","modified":"2026-06-17T02:23:11.170","status":"Analyzed","description":"Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 68.4.1, Thunderbird < 68.4.1, and Firefox < 72.0.1.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-843"],"references":["http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.html","https://bugzilla.mozilla.org/show_bug.cgi?id=1607443","https://security.gentoo.org/glsa/202003-02","https://usn.ubuntu.com/4335-1/","https://www.mozilla.org/security/advisories/mfsa2020-03/"],"products":["canonical:ubuntu_linux","mozilla:firefox","mozilla:thunderbird"],"source":"nvd","synced_at":"2026-10-19T21:02:53.949909883+00:00"},"epss":{"cve":"CVE-2019-17026","score":0.46311,"percentile":0.98817,"date":"2026-10-31"},"kev":{"cve":"CVE-2019-17026","date_added":"2021-11-03","due_date":"2022-05-03","vendor":"Mozilla","product":"Firefox and Thunderbird","known_ransomware":false},"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}