Live › vulnerability › CVE-2026-118021
Go to dashboardA use-after-free bug in Firefox's XPCOM component allows a sandbox escape. The sources do not say what an attacker gains beyond leaving the sandbox.
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.
Teams that run or ship Firefox builds older than version 159, including managed desktops and kiosks where users browse untrusted sites. The sources do not say whether ESR branches or other Mozilla products are affected, so unknown for those. Teams that only run Firefox on fully updated builds can skip it.
No product ranges from the sources yet.
firefox --version or open About Firefox and compare against 159159 or laterEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
Sandbox escape due to use-after-free in the XPCOM component. This vulnerability was fixed in Firefox 159.
This page as .md · .json · in your agent: get_signal("CVE-2026-118021")
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