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CVE-2026-110843 – Denial of Service (Uncontrolled Resource Consumption) – n8n before 2.41.4 and 2.42

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Summary

CVE-2026-110843 is an uncontrolled resource consumption vulnerability (CWE-770, Allocation of Resources Without Limits or Throttling) in the unauthenticated OAuth authorize endpoint of n8n. A remote, unauthenticated attacker can create unlimited OAuth client records and potentially exhaust disk space. It is rated High, with a CVSS score of 8.2.

Technical details

  • Root cause: the unauthenticated OAuth authorize endpoint resolves clients by URL path, but stores the caller’s raw identifier as the record key.
  • Trigger conditions: the attacker sends client identifiers that differ only in their query string. Each variant is stored as a separate record.
  • Attack vector: network, with no privileges and no user interaction required.
  • Impact: unlimited first-party client records are created, bypassing the registration cap. The database can grow until the disk is full, affecting availability.

Affected software

  • n8n versions before 2.41.4
  • n8n 2.42.x versions before 2.42.1 (2.42.0)

Severity

  • CVSS v4.0 base score: 8.2 (High)
  • Vector: 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

Mitigation and recommended actions

  • Immediate: upgrade n8n to version 2.41.4 or later, or to 2.42.1 or later if running the 2.42.x branch.
  • No workarounds are listed in the sources reviewed. As a precaution, restrict network access to internet-exposed n8n instances where possible, and monitor database and disk growth.

References

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