FIREFOX · CVE-2026-124890 · Runtime
NO FIX YET · SEE WHAT TO DO
A use-after-free bug in the DOM Core and HTML component of Firefox lets memory be used after it is freed. The description does not say what an attacker gets at worst, and the sources give no severity.
first public Nov 10, 2026 · 1 source
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Anyone running Firefox or Firefox ESR older than the fixed versions named in the description. The sources do not say whether the flaw is reachable without user action, so unknown.
Not affected if already-on-fixed-version
Who cares browser, desktop, firefox
firefox --version.160, 115.45 (ESR 115) or 153.7 (ESR 153) as exposed.160115.45153.7Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.
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