CVE-2026-124864 · Runtime
NO FIX YET · SEE WHAT TO DO
A use-after-free bug in the Service Workers component of Firefox's DOM lets malicious web content escape the browser sandbox. An attacker who gets a user to visit a crafted page could run code outside the sandboxed content process.
first public Nov 10, 2026 · 1 source
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Anyone running a Firefox build older than the fixed versions who browses the web with Service Workers enabled, which is the default. Managed deployments using the ESR channel should check against the ESR fixed versions. Users who only run a patched version are not affected.
Not affected if patched-version
Who cares browsers, desktop, firefox
firefox --version on the machine.160 for Firefox or below 115.45 / 153.7 for the ESR branches.160115.45153.7Sandbox escape due to use-after-free in the DOM: Service Workers component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.
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