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TI-2026-30552 Aliases CVE-2026-42231GHSA-q5f4-99jv-pgg5

n8n: Prototype Pollution in XML Webhook Body Parser Leads to RCE

Priority MEDIUM 50CWE-1321Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · High · High
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 versions 1.123.32, 2.17.4, and 2.18.1, a flaw in the xml2js library used to parse XML request bodies in n8n's webhook handler allowed prototype pollution via a crafted XML payload. An authenticated user with permission to create or modify workflows could exploit this to pollute the JavaScript object prototype and, by chaining the pollution with the Git node's SSH operations, achieve remote code execution on the n8n host. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00851 58th percentileScored 2026-11-07
Fix Fixed n8n (n8n-io): 1.123.32, 2.17.4, 2.18.1n8n (npm): 1.123.32, 2.18.1, 2.17.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

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 1.123.32; 2.17.0 to before 2.17.4; 2.18.0 to before 2.18.11.123.32, 2.17.4, 2.18.1Patch availableCNA
—n8n (npm)before 1.123.321.123.32Patch availableGHSA-q5f4-99jv-pgg5
—n8n (npm)2.18.0 to before 2.18.12.18.1Patch availableGHSA-q5f4-99jv-pgg5
—n8n (npm)2.17.0 to before 2.17.42.17.4Patch availableGHSA-q5f4-99jv-pgg5
  • n8n Vendorn8n Affected before 1.123.32; 2.17.0 to before 2.17.4; 2.18.0 to before 2.18.1 Fixed in 1.123.32, 2.17.4, 2.18.1 Patch available CNA
  • n8n (npm) Vendor— Affected before 1.123.32 Fixed in 1.123.32 Patch available GHSA-q5f4-99jv-pgg5
  • n8n (npm) Vendor— Affected 2.18.0 to before 2.18.1 Fixed in 2.18.1 Patch available GHSA-q5f4-99jv-pgg5
  • n8n (npm) Vendor— Affected 2.17.0 to before 2.17.4 Fixed in 2.17.4 Patch available GHSA-q5f4-99jv-pgg5

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:n8n:n8n:*:*:*:*:enterprise:node.js:*:*before 1.123.32; 2.17.0 to before 2.17.4Vulnerablen8n
cpe:2.3:a:n8n:n8n:2.18.0:*:*:*:enterprise:node.js:*:*2.18.0Vulnerablen8n
  • cpe:2.3:a:n8n:n8n:*:*:*:*:enterprise:node.js:*:* Versions before 1.123.32; 2.17.0 to before 2.17.4 Vulnerable ·n8n
  • cpe:2.3:a:n8n:n8n:2.18.0:*:*:*:enterprise:node.js:*:* Versions 2.18.0 Vulnerable ·n8n

Remediation

  • Fix · CNA n8n (n8n-io) Fixed in 1.123.32, 2.17.4, 2.18.1
  • Fix · GHSA-q5f4-99jv-pgg5 n8n (npm) Fixed in 1.123.32 Advisory →
  • Fix · GHSA-q5f4-99jv-pgg5 n8n (npm) Fixed in 2.18.1 Advisory →
  • Fix · GHSA-q5f4-99jv-pgg5 n8n (npm) Fixed in 2.17.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42231
  2. 2026-10-03 Alias added: GHSA-q5f4-99jv-pgg5

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