Use-After-Free Vulnerability in Firefox by Mozilla

CVE-2026-84122

What is CVE-2026-84122?

A use-after-free vulnerability has been identified in the Audio/Video component of Firefox, potentially allowing an attacker to exploit the flaw for arbitrary code execution. This issue affects specific versions of the browser, including Firefox 155 and Firefox ESR versions 140.15 and 153.2. After being discovered, it has been addressed in security updates released by Mozilla to enhance user safety. Users are encouraged to upgrade to the latest available version to mitigate risks associated with this vulnerability.

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