---
id: CVE-2026-110843
title: >-
  n8n before 2.41.4 and 2.42.x before 2.42.1 contains an uncontrolled resource
  consumption vulnerability in the unauthenticated OAuth authorize endpoint,
  which resolves clients by URL path but stores the caller's raw identifier as
  the reco…
summary: >-
  n8n before 2.41.4 and 2.42.x before 2.42.1 contains an uncontrolled resource
  consumption vulnerability in the unauthenticated OAuth authorize endpoint,
  which resolves clients by URL path but stores the caller's raw identifier as
  the reco…
severity: high
cvss: 8.2
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-770
vendor: n8n-io
product: n8n
affected:
  - n8n < 2.41.4
  - n8n >= 2.42.0 < 2.42.1
published: '2026-10-14'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:17:33.663'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110843'
references:
  - url: 'https://github.com/n8n-io/n8n/security/advisories/GHSA-3qcw-p65v-c7vq'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/n8n-before-2.41.4-and-2.42.1-unauthenticated-unbounded-oauth-client-persistence-via-authorize-endpoint
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00291
epssPercentile: 0.21559
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T16:31:14.241306Z'
cvssSource: cna
ingestedAt: '2026-10-15T00:02:07.175Z'
---

## Overview

n8n before 2.41.4 and 2.42.x before 2.42.1 contains an uncontrolled resource consumption vulnerability in the unauthenticated OAuth authorize endpoint, which resolves clients by URL path but stores the caller's raw identifier as the record key. Unauthenticated attackers can send identifiers differing only in their query string to create unlimited first-party client records that bypass the registration cap, growing the database until the disk fills.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.