Skip to content
EXYS
Back to the CVEs

CVE-2026-118678

7.1, high

N8n-io n8n Prototype Pollution Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.1, high high CVSS v3.1
EPSS, next 30 days
n/a
Exploitation
No public evidence
Published
28 Oct 2026yesterday

Description

n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability that allows low-privileged users to alter built-in object behaviour by saving workflows with specially named connection keys. Attackers can add keys such as __proto__ to workflow connections, which the periodic history compaction task processes, causing logins and writes to fail with server errors.

Details

Vendor
N8n-io
Product
n8n
Weakness
CWE-1321 (opens in a new tab)
Status
Deferred
Updated
28 Oct 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

References 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other N8n-io CVEs

Every N8n-io CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-118641 n8n before 1.123.85, 2.x before 2.43.5, and 2.44.x before 2.44.1 contains an OData $filter injection vulnerability in the Microsoft… 7.5, high
  • CVE-2026-118642 N8n-io n8n Incorrect Authorization Vulnerability 7.1, high
  • CVE-2026-118643 N8n-io n8n Information Exposure Through an Error Message Vulnerability 8.2, high
  • CVE-2026-118644 n8n before 2.41.5 and 2.42.x before 2.42.2 passes a failed workflow's full execution context, including the identity of the user who… 7.7, high
  • CVE-2026-118645 n8n before 1.123.85, 2.x before 2.43.5, and 2.44.x before 2.44.1 contains a filter injection vulnerability in the Quick Base node, which… 8.7, high
  • CVE-2026-118647 N8n-io n8n Insertion of Sensitive Information into Log File Vulnerability 8.2, high
  • CVE-2026-118648 N8n-io n8n Cross-Site Scripting Vulnerability 7.3, high
  • CVE-2026-118649 N8n-io n8n Prototype Pollution Vulnerability 8.3, high

Beyond this page

Is CVE-2026-118678 in your network?

This page tells you how dangerous CVE-2026-118678 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-118678 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 29 Oct 2026, not the live upstream state.