CVE-2026-124872 · Other
NO FIX YET · SEE WHAT TO DO
Firefox has a use-after-free bug in its Cycle Collector component, which handles memory cleanup for objects. The sources do not state what an attacker can do with it.
first public Nov 10, 2026 · 1 source
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Anyone running a vulnerable Firefox release or ESR branch is affected. The sources do not say which configurations or browsing paths trigger the bug.
Not affected if already-on-fixed-version
Who cares browser, firefox
about:support or Help > About Firefox, and compare it with the fixed versions below.115.x or 153.x, since each branch has its own fixed version.160115.45153.7Use-after-free in the Cycle Collector component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.
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