CVE-2026-110843

n8n before 2.41.4 and 2.42.1 Unauthenticated Unbounded OAuth Client Persistence via Authorize Endpoint

State: Published
Severity: 8.2 High
Published: Oct 14, 2026
Updated: Oct 16, 2026
Reserved: Oct 14, 2026

Description

n8n before 2.41.4 and 2.42.x before 2.42.1 contains an uncontrolled resource consumption vulnerability in the unauthenticated OAuth authorize endpoint, which resolves clients by URL path but stores the caller's raw identifier as the record key. Unauthenticated attackers can send identifiers differing only in their query string to create unlimited first-party client records that bypass the registration cap, growing the database until the disk fills.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
n8nn8n-io	before 2.41.4Affected 2.42.0 to before 2.42.1Affected

References

GitHub Security Advisory (GHSA-3qcw-p65v-c7vq)vendor-advisory
VulnCheck Advisory: n8n before 2.41.4 and 2.42.1 Unauthenticated Unbounded OAuth Client Persistence via Authorize Endpointthird-party-advisory

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