CVE-2026-124884 · Runtime
NO FIX YET · SEE WHAT TO DO
A use-after-free bug in the JavaScript garbage collector of Firefox could let a crafted script corrupt memory. The sources state it was fixed in Firefox 160 and Firefox ESR 153.7, but they do not say what an attacker gains beyond memory corruption.
first public Nov 10, 2026 · 1 source
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Anyone running a Firefox build older than 160 or Firefox ESR older than 153.7 is exposed, since a web page can run JavaScript that triggers the flaw. Teams that run only current Firefox releases or managed browser builds with updates applied can skip it.
Not affected if up-to-date-firefox
Who cares browsers, desktop, firefox
firefox --version on the machine.160 for Firefox and 153.7 for Firefox ESR.160153.7Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.
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