VulnerabilityPublished 27 Oct 2026

CVE-2026-118017: Mozilla Firefox · Use-after-free in the SVG Component

Affects Mozilla FirefoxSource CVE Database V5

Not known to be exploited.

Data as of 27 Oct 2026, 14:42 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 Firefox to version 159 or later to remediate this vulnerability. Mozilla has officially fixed the issue in Firefox 159, so applying this update fully mitigates the risk. No additional action is required beyond updating to the fixed version.

Description

CVE-2026-118017 is a use-after-free vulnerability in the SVG component of Mozilla Firefox. This security flaw was addressed and fixed in Firefox version 159. The vulnerability is classified with high impact by Mozilla, indicating serious security concerns if exploited. No specific affected versions are listed beyond the fix in Firefox 159. There is no public exploit known in the wild for this issue as of the advisory date.

Impact

The vulnerability is rated as high impact by Mozilla, indicating that exploitation could lead to significant security consequences such as memory corruption or potential privilege escalation. However, no active exploitation in the wild has been reported. The flaw affects the SVG component, a critical part of rendering scalable vector graphics in the browser.

Summary

This vulnerability involves a use-after-free condition in the SVG component of Firefox, which could potentially lead to memory corruption or other security issues. Mozilla has fixed this vulnerability in Firefox 159. The advisory is part of a broader set of high-impact security fixes released simultaneously. The vendor advisory explicitly states the fix is included in Firefox 159, confirming remediation is available.

References

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 27 Oct 2026, 14:31 UTC

Technical details

References

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