Vulnerability in n8n Workflow Automation Platform Affecting OAuth Dynamic Client Registration
CVE-2026-86075

8.7HIGH

Key Information:

Vendor

N8n-io

Status
N8n
Vendor
CVE Published:
8 September 2026

What is CVE-2026-86075?

The n8n workflow automation platform is affected by a vulnerability in its OAuth Dynamic Client Registration endpoint. This issue allows an unauthenticated remote attacker to input oversized values for client_name and grant_types, leading to potential database storage exhaustion. The vulnerability lies in the insufficient validation of input lengths, which can cause disruptions in service. The problem has been addressed in versions 2.37.7 and 2.38.2, which include enhancements to limit the size of these inputs to predefined maximum lengths.

Affected Version(s)

n8n < 2.37.7 < 2.37.7

n8n >= 2.38.0, < 2.38.2 < 2.38.0, 2.38.2

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-hh...
x_refsource_CONFIRM
https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7
x_refsource_MISC
https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.