CVE-2026-86075n8n: Unauthenticated Persistent Storage Exhaustion via OAuth Dynamic Client Registration Endpoint
Updated under an hour ago ()
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It affects n8n-io n8n and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.7 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Sep 9, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
n8n-io n8n n8n_io:n8n (from the name) | before 2.37.7; from 2.38.0, < 2.38.2 | CNA record |
n8n n8n n8n:n8n | before 2.37.7; from 2.38.0 before 2.38.2 | NVD |
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-hh89-3r9w-qj3jx-refsource-confirm, mitigation, vendor-advisory
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7x-refsource-misc, release-notes
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2x-refsource-misc, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.