CVE-2026-124877 · Runtime
NO FIX YET · SEE WHAT TO DO
A use-after-free bug in Firefox's Layout: Positioned component lets memory be reused after it is freed. An attacker who gets a user to load a crafted page could potentially run code in the browser, though the sources do not state this.
first public Nov 10, 2026 · 1 source
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Anyone running a Firefox build older than the fixed versions, including desktop users on the affected release lines. The sources do not say which configurations or page types trigger the flaw, so unknown.
Not affected if already-on-fixed-version
Who cares browser, firefox
160, 115.45 (ESR) and 153.7 (ESR).160115.45153.7Use-after-free in the Layout: Positioned component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.
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