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TI-2026-39207 Aliases CVE-2026-54311GHSA-9c38-2mcm-q7f7

n8n: Merge Node SQL Mode Prototype Pollution

Priority LOW 27CWE-488Published · Updated

Key facts

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

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

Summary

n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, an authenticated user with permission to create or modify workflows could pollute the sandbox used by the Merge node's SQL Query mode. Because the sandbox context was cached and reused across all workflow executions on the instance, prototype mutations introduced by one user's workflow persist into subsequent Merge SQL executions belonging to other users or projects. This allowed a low-privileged attacker to intercept workflow data processed by other users on the same instance. This issue only affects multi-user n8n instances where more than one user has permission to create and execute workflows containing the Merge node in SQL Query mode. This vulnerability is fixed in 2.25.7 and 2.26.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00391 33rd percentileScored 2026-11-07
Fix Fixed n8n (n8n-io): 2.26.2, 2.25.7n8n (npm): 2.26.2, 2.25.7

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
n8nn8n2.26.0 to before 2.26.2; before 2.25.72.26.2, 2.25.7Patch availableCNA
—n8n (npm)2.26.0 to before 2.26.22.26.2Patch availableGHSA-9c38-2mcm-q7f7
—n8n (npm)before 2.25.72.25.7Patch availableGHSA-9c38-2mcm-q7f7
  • n8n Vendorn8n Affected 2.26.0 to before 2.26.2; before 2.25.7 Fixed in 2.26.2, 2.25.7 Patch available CNA
  • n8n (npm) Vendor— Affected 2.26.0 to before 2.26.2 Fixed in 2.26.2 Patch available GHSA-9c38-2mcm-q7f7
  • n8n (npm) Vendor— Affected before 2.25.7 Fixed in 2.25.7 Patch available GHSA-9c38-2mcm-q7f7

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*before 2.25.7; 2.26.0 to before 2.26.2Vulnerablen8n
  • cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:* Versions before 2.25.7; 2.26.0 to before 2.26.2 Vulnerable ·n8n

Remediation

  • Fix · CNA n8n (n8n-io) Fixed in 2.26.2, 2.25.7
  • Fix · GHSA-9c38-2mcm-q7f7 n8n (npm) Fixed in 2.26.2 Advisory →
  • Fix · GHSA-9c38-2mcm-q7f7 n8n (npm) Fixed in 2.25.7 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54311
  2. 2026-10-03 Alias added: GHSA-9c38-2mcm-q7f7

References

Advisory 2

Other 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-2025-35293 An arbitrary file upload vulnerability in the Chat Trigger component of N8N v1.95.3… CVSS 3.1HIGH 8.8
  • TI-2023-12275 The n8n package 0.218.0 for Node.js allows Escalation of Privileges. CVSS 3.1HIGH 8.8
See all 178 →

Sources

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