CVE-2026-124863 · Runtime
NO FIX YET · SEE WHAT TO DO
Firefox's HTML parser frees memory that is still referenced, a use-after-free bug. The sources do not say what an attacker can achieve beyond memory corruption.
first public Nov 10, 2026 · 1 source
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Anyone running Firefox or Firefox ESR builds older than the fixed versions. The sources do not describe a specific page or configuration that triggers the flaw, so it is unknown whether a remote page alone is enough.
Not affected if up-to-date-firefox
Who cares browsers, desktop, firefox
firefox --version160115.45153.7Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.
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