Use-after-free Vulnerability in Firefox by Mozilla

CVE-2026-84124

What is CVE-2026-84124?

A use-after-free vulnerability was identified in the DOM, impacting the Core and HTML components of the Firefox browser. This flaw can potentially allow attackers to exploit the browser's memory handling mechanisms, potentially leading to arbitrary code execution or other unintended behavior. Mozilla has addressed this issue in version 155 of Firefox, as well as in the Extended Support Release (ESR) versions 140.15 and 153.2. It is critical for users to update to these versions to mitigate any threats stemming from this vulnerability.

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