CVE-2026-124882 · Runtime
NO FIX YET · SEE WHAT TO DO
A use-after-free bug in Firefox's CSS parsing and computation component can corrupt memory when a page is processed. Attackers may be able to use it to run code in the browser, but the sources do not say how it is triggered.
first public Nov 10, 2026 · 1 source
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Anyone running an unpatched Firefox release, including the standard and ESR branches named in the advisory. Systems that ship Firefox from an OS package manager depend on that distributor's update. The sources do not say whether the flaw needs a particular page or setting to trigger.
Not affected if updated-firefox
Who cares browsers, desktop, firefox
firefox --version on the command line.160, 115.45 for the ESR 115 branch, or 153.7 for the ESR 153 branch.160115.45153.7Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.
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