Allocation of Resources Without Limits or Throttling in n8n - #VU153002
Published: September 30, 2026
Vulnerability identifier: #VU153002
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: N/A
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in the OAuth authorization endpoint when resolving OAuth clients from URL paths. A remote attacker can send authorization requests with identifiers that differ only by query strings to cause a denial of service.
The persisted records are marked as first-party and outlive the resources they name.
Affected software
n8n
Remediation
Install security update from vendor's website.
n8n - addressed in versions 2.41.4, 2.42.1