CVE-2026-117997

CriticalCVSS 9.6/10Last modified Nov 5, 2026

Description

Sandbox escape due to use-after-free in the Widget component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Metrics

CVSS 3.1 9.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

No affected versions have been published.

Timeline

Published
Oct 27, 2026
Last modified
Nov 5, 2026
NVD status
Deferred

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CVE-2026-117997: Critical severity, CVSS 9.6 | Vulnix