Race Condition in Firefox and Firefox ESR by Mozilla

CVE-2026-109776

What is CVE-2026-109776?

A race condition was identified in the XPCOM component of Mozilla's Firefox browser, which could potentially allow for unexpected behaviors and security concerns. This vulnerability affects specific versions of Firefox and its Extended Support Release (ESR), making it crucial for users to update to the latest versions, Firefox 158 and Firefox ESR 153.5, to ensure the integrity and security of their browsing experience.

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