CVE-2026-86075CWE-770denial-of-service

CVE-2026-86075

High · published September 9, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
48.5
In the wild
Unconfirmed
What it is

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 record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00609 · 48.5th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-09-09T02:19Z
Affected products (2)
ProductVersionsFixed in
n8n/n8n< 2.37.72.37.7
n8n/n8n≥ 2.38.0, < 2.38.22.38.2
References (3)
https://github.com/n8n-io/n8n/releases/tag/[email protected] · [email protected]https://github.com/n8n-io/n8n/releases/tag/[email protected] · [email protected]https://github.com/n8n-io/n8n/security/advisories/GHSA-hh89-3r9w-qj3j · [email protected]
EPSS history
Timeline
  • 10 SEP 03:18Z
    EPSS moved — → 0%
    epss
  • 08 SEP 21:29Z
    n8n: Unauthenticated Persistent Storage Exhaustion via OAuth Dynamic Client Registration Endpoint
    cvelistv5