{"id":"CVE-2026-109716","published":"2026-10-13T12:29:18Z","modified":"2026-10-16T18:15:34Z","title":"Incorrect boundary conditions in the JavaScript Engine component","vendor":"Mozilla","product":"Firefox","tier":"tail","description":{"text":"Incorrect boundary conditions in the JavaScript Engine component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.","provenance":"source","from":"CVE.org"},"cvss":{"score":8.1,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.00314,"percentile":0.24236,"provenance":"source"},"cwes":[{"id":"CWE-119","name":"Improper Restriction of Operations within the Bounds of a Memory Buffer"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2073269","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-107/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-108/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/","tags":[]},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-110/","tags":[]}],"priority":{"score":10.5,"factors":[{"name":"EPSS percentile","points":4.85},{"name":"CVSS severity","points":5.67}]},"vendorSlug":"mozilla","euvd":{"id":"EUVD-2026-98639","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-mozilla-firefox-cwe-119"}}