Live › vulnerability › CVE-2026-117877
Go to dashboardA use-after-free flaw in Firefox's Layout: Text and Fonts component lets memory be reused after it is freed. The sources do not say what an attacker can do beyond that, but memory corruption of this kind in a browser is commonly exploited to run code.
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 Firefox or Firefox ESR older than the fixed versions, including managed desktop fleets that pin browser builds. The sources do not say whether any specific configuration or page type is needed to trigger it, so unknown for the trigger path.
No product ranges from the sources yet.
firefox --version (or check Help > About Firefox) and compare against the fixed versions.159 or later.153.6 or later.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.
This page as .md · .json · in your agent: get_signal("CVE-2026-117877")
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.