CVE-2026-124876 · Runtime
NO FIX YET · SEE WHAT TO DO
A use-after-free bug in Firefox's CSS parsing and computation code lets memory be reused after it is freed. A crafted web page could potentially corrupt memory and run code in the browser.
first public Nov 10, 2026 · 1 source
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Anyone running a Firefox version older than 160, or an ESR release older than 115.45 or 153.7, is exposed when browsing untrusted pages. The sources do not describe a special configuration; the flaw is in the default CSS engine.
Not affected if already-updated
Who cares browsers, desktop, firefox
firefox --version160, 115.45 (ESR) and 153.7 (ESR)160 or later115.45 or 153.7Use-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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