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TI-2026-74538 Aliases CVE-2026-110848

Prototype pollution in n8n AI workflow builder connection merge

Priority LOW 27CWE-1321Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

n8n versions before 1.123.83, from 2.0.0 before 2.41.4, and from 2.42.0 before 2.42.1 are affected. The AI workflow builder merges workflow connections using node names as object keys without rejecting reserved keys, which is a prototype pollution flaw (CWE-1321). An authenticated user with low privileges can pollute the global object prototype, disrupting the instance until it restarts.

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

Description from the CNA

n8n before 1.123.83, 2.x before 2.41.4, and 2.42.x before 2.42.1 contains a prototype pollution vulnerability in the AI workflow builder, which merges workflow connections using node names as object members without checking for reserved keys. Authenticated users can create nodes named __proto__ through the API and invoke the connect-nodes operation to pollute the global object prototype, disrupting the instance until restart.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00312 24th percentileScored 2026-11-07
Fix Fixed n8n (n8n-io): 1.123.83, 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 1.123.83; 2.0.0 to before 2.41.4; 2.42.0 to before 2.42.11.123.83, 2.41.4, 2.42.1Patch availableCNA
  • n8n Vendorn8n Affected before 1.123.83; 2.0.0 to before 2.41.4; 2.42.0 to before 2.42.1 Fixed in 1.123.83, 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

Update n8n to version 1.123.83, 2.41.4, or 2.42.1, depending on the release line in use.

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

  • Fix · CNA n8n (n8n-io) Fixed in 1.123.83, 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 1.123.83, 2.41.4, 2.42.1

    5 records Highest priority Priority LOW 5 LOW

    Other records, highest priority first

    • TI-2026-74535 Code execution in n8n Git node Log operationPriority LOW 36
    • TI-2026-74539 n8n Stored XSS via Binary-Data File PreviewPriority LOW 33
    • TI-2026-74537 Stored cross-site scripting in n8n Chat Trigger customCssPriority LOW 31
    Show all 5 records →

Timeline

  1. 2026-10-15 Threatist record created from CVE-2026-110848
  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