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CVE-2026-86075 Details

Description

n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.2, the OAuth Dynamic Client Registration endpoint bounded redirect_uris but accepted arbitrarily large client_name and grant_types values. An unauthenticated remote caller could repeatedly persist oversized values in oauth_clients and exhaust database storage. The affected validation is in packages/cli/src/modules/oauth-server/oauth-server.service.ts, including MAX_CLIENT_NAME_LENGTH and MAX_GRANT_TYPES. This issue is fixed in versions 2.37.7 and 2.38.2.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/n8n-io/n8n/releases/tag/[email protected]	[email protected]	Release Notes
https://github.com/n8n-io/n8n/releases/tag/[email protected]	[email protected]	Release Notes
https://github.com/n8n-io/n8n/security/advisories/GHSA-hh89-3r9w-qj3j	[email protected]	MitigationVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-770	Allocation of Resources Without Limits or Throttling	[email protected]

Affected Products

Product	Versions
n8n n8n	< 2.37.7 >= 2.38.0, < 2.38.2
CPE cpe:2.3:a:n8n:n8n::::::node.js::* Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Sep 11, 2026	Initial Analysis	[email protected]
Sep 9, 2026	CVE Modified	CISA-ADP
Sep 8, 2026	New CVE Received	[email protected]