JIT Miscompilation Vulnerability in Firefox by Mozilla

CVE-2026-12299

What is CVE-2026-12299?

A vulnerability has been identified in Mozilla's Firefox browser related to just-in-time (JIT) miscompilation within the DOM: Core and HTML components. This flaw can lead to potential security risks, affecting the functionality and performance of web applications. Mozilla has addressed this issue in the latest releases, specifically in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37, emphasizing the importance of timely updates to maintain security integrity. For more details, users are encouraged to refer to Mozilla's official security advisories.

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