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TI-2026-21903 Aliases CVE-2026-27496GHSA-xvh5-5qg4-x9qp

n8n has In-Process Memory Disclosure in its Task Runner

Priority LOW 31CWE-908Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-908 and the CVSS impact.

Summary

n8n is an open source workflow automation platform. Prior to versions 1.123.22, 2.9.3, and 2.10.1, an authenticated user with permission to create or modify workflows could use the JavaScript Task Runner to allocate uninitialized memory buffers. Uninitialized buffers may contain residual data from the same Node.js process — including data from prior requests, tasks, secrets, or tokens — resulting in information disclosure of sensitive in-process data. Task Runners must be enabled using `N8N_RUNNERS_ENABLED=true`. In external runner mode, the impact is limited to data within the external runner process. The issue has been fixed in n8n versions 1.123.22, 2.10.1 , and 2.9.3. Users should upgrade to this version or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations: Limit workflow creation and editing permissions to fully trusted users only, and/or use external runner mode (`N8N_RUNNERS_MODE=external`) to isolate the runner process. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00272 19th percentileScored 2026-11-07
Fix Fixed n8n (n8n-io): 1.123.22, 2.9.3, 2.10.1n8n (npm): 1.123.22, 2.10.1, 2.9.3

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 1.123.22; 2.0.0-rc.0 to before 2.9.3; 2.10.0 to before 2.10.11.123.22, 2.9.3, 2.10.1Patch availableCNA
—n8n (npm)before 1.123.221.123.22Patch availableGHSA-xvh5-5qg4-x9qp
—n8n (npm)2.10.0 to before 2.10.12.10.1Patch availableGHSA-xvh5-5qg4-x9qp
—n8n (npm)2.0.0-rc.0 to before 2.9.32.9.3Patch availableGHSA-xvh5-5qg4-x9qp
  • n8n Vendorn8n Affected before 1.123.22; 2.0.0-rc.0 to before 2.9.3; 2.10.0 to before 2.10.1 Fixed in 1.123.22, 2.9.3, 2.10.1 Patch available CNA
  • n8n (npm) Vendor— Affected before 1.123.22 Fixed in 1.123.22 Patch available GHSA-xvh5-5qg4-x9qp
  • n8n (npm) Vendor— Affected 2.10.0 to before 2.10.1 Fixed in 2.10.1 Patch available GHSA-xvh5-5qg4-x9qp
  • n8n (npm) Vendor— Affected 2.0.0-rc.0 to before 2.9.3 Fixed in 2.9.3 Patch available GHSA-xvh5-5qg4-x9qp

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*before 1.123.22; 2.0.0 to before 2.9.3Vulnerablen8n
cpe:2.3:a:n8n:n8n:2.10.0:*:*:*:*:node.js:*:*2.10.0Vulnerablen8n
  • cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:* Versions before 1.123.22; 2.0.0 to before 2.9.3 Vulnerable ·n8n
  • cpe:2.3:a:n8n:n8n:2.10.0:*:*:*:*:node.js:*:* Versions 2.10.0 Vulnerable ·n8n

Remediation

  • Fix · CNA n8n (n8n-io) Fixed in 1.123.22, 2.9.3, 2.10.1
  • Fix · GHSA-xvh5-5qg4-x9qp n8n (npm) Fixed in 1.123.22 Advisory →
  • Fix · GHSA-xvh5-5qg4-x9qp n8n (npm) Fixed in 2.10.1 Advisory →
  • Fix · GHSA-xvh5-5qg4-x9qp n8n (npm) Fixed in 2.9.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27496
  2. 2026-10-03 Alias added: GHSA-xvh5-5qg4-x9qp

References

Advisory 2

Other 3

  • 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