Live › vulnerability › CVE-2026-117891
Go to dashboardA use-after-free bug in the JIT compiler of Firefox's JavaScript engine lets memory be reused after it is freed. Per the sources, it was fixed in Firefox 159 and Firefox ESR 115.44 and 153.6, and the sources do not say what an attacker gets beyond that memory-safety flaw.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-27 14:32 UTC. All times on this page are UTC.
Anyone running a Firefox build older than the fixed versions, including ESR installs, on desktops or managed fleets. The sources do not say whether a specific configuration or site is required, so unknown whether some setups can skip it.
No product ranges from the sources yet.
firefox --version (or check About Firefox) and compare against 159 for Firefox or 115.44 / 153.6 for the ESR branches159 or later115.44 or 153.6 or laterEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.
This page as .md · .json · in your agent: get_signal("CVE-2026-117891")
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