CVE-2026-124939 · Runtime
NO FIX YET · SEE WHAT TO DO
A JIT compiler bug in Firefox's JavaScript engine can produce incorrect machine code when scripts run. Sources do not state the attacker outcome beyond the miscompilation itself.
first public Nov 10, 2026 · 1 source
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Anyone running Firefox or Firefox ESR older than the fixed versions. Sources do not describe any server-side or configuration-dependent exposure.
Not affected if up-to-date-firefox
Who cares browsers, firefox
firefox --version160 or later153.7 or laterJIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.
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