VulnerabilityPublished 27 Oct 2026

CVE-2026-117969: Mozilla Firefox · Invalid pointer in the JavaScript Engine: JIT component

Affects Mozilla FirefoxSource CVE Database V5

Not known to be exploited.

Data as of 27 Oct 2026, 14:58 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.

What to do

AI-suggested

Users and administrators should update affected Firefox installations to version 159 or later, or Firefox ESR 153.6 or later, to remediate this vulnerability. Since the vendor advisory confirms the availability of an official fix, applying these updates is the recommended and effective mitigation.

Description

CVE-2026-117969 is a vulnerability in the JavaScript Engine's JIT component of Mozilla Firefox. It involves an invalid pointer issue that could lead to memory safety problems. This vulnerability was addressed and fixed in Firefox version 159 and Firefox ESR 153.6.

Impact

The vulnerability is rated with high impact, suggesting that successful exploitation could lead to serious security consequences such as memory corruption or potential code execution. However, no active exploitation in the wild has been documented. The fix in Firefox 159 and ESR 153.6 mitigates the risk.

Summary

This vulnerability concerns an invalid pointer in the Just-In-Time (JIT) component of the JavaScript Engine used by Mozilla Firefox. The issue was identified and resolved by Mozilla, with the fix incorporated in Firefox 159 and Firefox ESR 153.6. The advisory classifies the impact as high, indicating significant security implications if exploited. No evidence of exploitation in the wild has been reported. The vendor advisory is the authoritative source confirming the fix and impact level.

References

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 27 Oct 2026, 14:58 UTC

Technical details

References

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