CVE-2026-124917 · Runtime
NO FIX YET · SEE WHAT TO DO
A use-after-free bug in Firefox's GTK widget component allows a sandbox escape. An attacker who can get content running in the browser could use it to break out of the browser's sandbox.
first public Nov 10, 2026 · 1 source
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Anyone running Firefox or Firefox ESR on Linux or other systems using the GTK widget component before the fixed versions. Exposure comes from browsing untrusted web content. Systems on managed Firefox builds should follow their own update channel.
Not affected if already-updated, non-gtk-platform
Who cares firefox, firefox-esr, gtk, linux
firefox --version, and compare it with the fixed versions below.160 or later.153.7 or later.Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.
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