CVE-2026-124889 · Runtime
NO FIX YET · SEE WHAT TO DO
A use-after-free bug in Firefox's CSS Parsing and Computation component lets memory be reused after it is freed. The sources do not state what an attacker can do beyond that, so the impact is not confirmed.
first public Nov 10, 2026 · 1 source
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Anyone running Firefox before the fixed versions named in the sources. The sources do not say whether the bug is reachable from ordinary web browsing or needs special conditions. unknown for the exact trigger.
Not affected if firefox-160-or-later, firefox-esr-153.7-or-later
Who cares browser, firefox
firefox --version on the command line.160 or later.153.7 or later.Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.
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