CVE-2026-86075 n8n - Denial of Service

n8n < 2.37.7 and < 2.38.2 contains a denial of service caused by lack of size validation on client_name and grant_types in OAuth Dynamic Client Registration endpoint, letting unauthenticated remote attackers exhaust database storage by persisting oversized values.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.61% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
8 September 2026
Updated
15 October 2026
Weakness
CWE-770

Vendor fix

Upgrade to versions 2.37.7 or 2.38.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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