n8n-io n8n up to 2.37.6/2.38.1 OAuth Server oauth-server.service.ts client_name/grant_types resource consumption

Summaryinfo

A vulnerability was found in n8n-io n8n up to 2.37.6/2.38.1. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file packages/cli/src/modules/oauth-server/oauth-server.service.ts of the component OAuth Server. The manipulation of the argument client_name/grant_types results in resource consumption. This vulnerability is identified as CVE-2026-86075. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in n8n-io n8n up to 2.37.6/2.38.1. It has been classified as problematic. Affected is some unknown processing of the file packages/cli/src/modules/oauth-server/oauth-server.service.ts of the component OAuth Server. The manipulation of the argument client_name/grant_types with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-86075 since 09/04/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 2.37.7 or 2.38.2 eliminates this vulnerability.

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Productinfo

Vendor

• n8n-io

Name

• n8n

Version

• 2.37.0
• 2.37.1
• 2.37.2
• 2.37.3
• 2.37.4
• 2.37.5
• 2.37.6
• 2.38.0
• 2.38.1

Website

• Product: https://github.com/n8n-io/n8n/

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