Live › vulnerability › CVE-2026-117899
Go to dashboardA use-after-free bug in Firefox's HTTP networking component reuses memory after it has been freed. The sources do not say what an attacker gets from it, beyond that it was fixed in Firefox 159, Firefox ESR 115.44 and Firefox ESR 153.6.
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 builds older than the fixed versions on desktops or in managed fleets. The sources do not describe a server-side or web-app exposure, so teams that only run Firefox on end-user machines are the ones to check. unknown whether the bug needs a specific page or request pattern to trigger.
No product ranges from the sources yet.
firefox --version or open Help > About Firefox and compare with 159, 115.44 or 153.6.159 or later.115.44 or 153.6, depending on the branch in use.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Use-after-free in the Networking: HTTP 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-2026-117899")
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