Use-After-Free Vulnerability in Firefox by Mozilla

CVE-2026-100831

What is CVE-2026-100831?

A use-after-free vulnerability was identified in the DOM handling of UI Events and Focus Management in Firefox. This flaw may enable attackers to exploit freed memory, potentially leading to arbitrary code execution, data corruption, or application crashes. The issue has been addressed in the latest versions of Firefox ESR and standard Firefox builds, ensuring enhanced protection against such memory-related vulnerabilities.

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