CVE-2026-124860 · Runtime
NO FIX YET · SEE WHAT TO DO
Firefox has a use-after-free bug in its Audio/Video component, where memory is used after it has been freed. The sources do not state what an attacker gets beyond that, so impact is unconfirmed.
first public Nov 10, 2026 · 1 source
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Anyone running a Firefox build older than the fixed versions is exposed, since the flaw is in the browser's own Audio/Video code. Sources do not say whether web content alone triggers it or whether a specific media setting is required. Teams that manage browsers should check the Firefox versions on their machines.
Not affected if already-on-fixed-version
Who cares browsers, desktop, firefox
firefox --version160, Firefox ESR 115.45, Firefox ESR 153.7160 or later115.45 or later153.7 or laterUse-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.
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