VulnerabilityPublished 27 Oct 2026

CVE-2026-118007: Use-after-free in the JavaScript · GC component

Source GCVE Database

Authoritative record:CVE-2026-118007· High

Not known to be exploited.

Data as of 27 Oct 2026, 16:44 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Exploitation evidence

Disclosed: evidence found.
CVE published 27 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-w5hw-5frr-gr9h

What to do

AI-suggested

A fix for this vulnerability is available in Firefox 159. Users and administrators should update to Firefox 159 or later to mitigate this issue. No additional mitigation actions are required beyond applying the official update.

Description

CVE-2026-118007 is a use-after-free vulnerability in the JavaScript garbage collection (GC) component of Firefox. This flaw was addressed and fixed in Firefox version 159. The vulnerability is rated with high impact by the vendor.

Impact

The vulnerability is classified as high impact by Mozilla, indicating that successful exploitation could lead to serious security consequences such as memory corruption or potential privilege escalation. However, no active exploitation has been reported.

Summary

This vulnerability involves a use-after-free condition in the JavaScript GC component of Firefox, which could potentially lead to memory corruption or other security issues. Mozilla has fixed this vulnerability in Firefox 159 as part of a broader security update addressing multiple high-impact issues. No public exploit code or in-the-wild exploitation has been reported.

References

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