CVE-2026-124858 · Runtime
NO FIX YET · SEE WHAT TO DO
A use-after-free bug in the DOM HTML Parser component of Firefox can corrupt memory when a page is processed. The sources do not state what an attacker can get beyond that, so the impact is unconfirmed.
first public Nov 10, 2026 · 1 source
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Anyone running an affected desktop Firefox release, including ESR branches, who browses web pages. The sources do not describe a special configuration or required account, so default installs are likely exposed.
Not affected if fixed-version
Who cares browser, desktop, firefox
160, 115.45 (ESR 115), or 153.7 (ESR 153) are affected per the description160115.45153.7Use-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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