Use-after-free Vulnerability in Firefox Browser and ESR Version

CVE-2026-84125

What is CVE-2026-84125?

A use-after-free vulnerability exists in the DOM components of the Firefox web browser, as well as the Extended Support Release (ESR) version. This flaw can lead to potential exploitation of memory Corruption, which attackers could leverage to execute arbitrary code. Mozilla has identified and fixed this issue in Firefox version 155 and Firefox ESR version 153.2, ensuring enhanced security for users.

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