CVE-2026-110843: Allocation of Resources Without Limits or Throttling in n8n-io n8n
Description
n8n versions before 2.41.4 and 2.42.x before 2.42.1 have a vulnerability in the unauthenticated OAuth authorize endpoint that allows attackers to create unlimited client records by manipulating query strings. This leads to uncontrolled resource consumption and potential disk space exhaustion.
CVSS v4.0
Score 8.2high
Affected software
n8n-io
n8n
pkg:github/n8n-io/n8nRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-110843 describes an uncontrolled resource consumption vulnerability in n8n's unauthenticated OAuth authorize endpoint. The endpoint resolves clients by URL path but uses the caller's raw identifier as the record key. Attackers can exploit this by sending identifiers that differ only in their query strings, bypassing the client registration cap and creating unlimited first-party client records. This causes the database to grow until the disk is filled, potentially leading to denial of service due to resource exhaustion.
Potential Impact
An unauthenticated attacker can cause excessive resource consumption by creating unlimited client records, which can fill the disk and disrupt normal operation of the n8n service. This may result in denial of service conditions due to lack of disk space.
Mitigation Recommendations
A fix is available in n8n versions 2.41.4 and 2.42.1. Users should upgrade to these or later versions to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-14T22:12:22.055Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad00a612cdf04f656ba025d
Added to database: 10/14/2026, 23:04:01 UTC
Last enriched: 10/14/2026, 23:19:44 UTC
Last updated: 10/14/2026, 23:28:24 UTC
Views: 4
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