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TI-2026-74533 Aliases CVE-2026-110843

Unbounded OAuth client creation in n8n lets attackers fill disk

Priority LOW 35CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

n8n before 2.41.4 and from 2.42.0 before 2.42.1 is affected. The unauthenticated OAuth authorize endpoint stores the caller's raw client identifier as the record key, so identifiers that differ only in their query string create separate first-party client records that bypass the registration cap (CWE-770). An unauthenticated remote attacker can create unlimited client records, growing the database until the disk fills.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00291 21st percentileScored 2026-11-08
Fix Fixed n8n (n8n-io): 2.41.4, 2.42.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
n8nn8nbefore 2.41.4; 2.42.0 to before 2.42.12.41.4, 2.42.1Patch availableCNA
  • n8n Vendorn8n Affected before 2.41.4; 2.42.0 to before 2.42.1 Fixed in 2.41.4, 2.42.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*——n8n
  • cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:* Versions — — ·n8n

Remediation

Upgrade n8n to version 2.41.4 or 2.42.1.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA n8n (n8n-io) Fixed in 2.41.4, 2.42.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    n8n-io n8n 2.41.4, 2.42.1

    6 records Highest priority Priority LOW 6 LOW

    Other records, highest priority first

    • TI-2026-74536 Signature bypass in n8n Send-and-Wait waiting-webhook endpointPriority LOW 39
    • TI-2026-74530 SQL injection in n8n Microsoft SQL node via Query fieldPriority LOW 37
    • TI-2026-74532 Prototype pollution in n8n MCP tool enables owner account takeoverPriority LOW 35
    Show all 6 records →

Timeline

  1. 2026-10-15 Threatist record created from CVE-2026-110843
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-16 CISA SSVC decision points changed

References

Advisory 1

  • TI-2025-42131 n8n Vulnerable to Remote Code Execution via Expression Injection KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-17560 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling CVSS 3.1CRITICAL 10.0
  • TI-2026-01167 Authenticated users can bypass the Expression sandbox mechanism to achieve full remote… CVSS 3.1CRITICAL 9.9
  • TI-2026-00644 Sandbox escape in n8n Python task runner allows for arbitrary code execution on the underlying host. CVSS 3.1CRITICAL 9.9
  • TI-2026-82991 Code execution in n8n via deprecated Function nodes CVSS 4.0HIGH 8.7
  • TI-2025-35293 An arbitrary file upload vulnerability in the Chat Trigger component of N8N v1.95.3… CVSS 3.1HIGH 8.8
See all 233 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences