CVE-2026-27496

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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://docs.n8n.io/hosting/configuration/task-runners	Product
https://docs.n8n.io/hosting/securing/blocking-nodes	Product
https://github.com/n8n-io/n8n/security/advisories/GHSA-xvh5-5qg4-x9qp	Vendor Advisory Mitigation

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:n8n:n8n::::::node.js::*
	cpe:2.3:a:n8n:n8n::::::node.js::*
	cpe:2.3:a:n8n:n8n:2.10.0:::::node.js::

History

No history.

Information

Published : 2026-03-25 18:16

Updated : 2026-03-27 19:48

NVD link : CVE-2026-27496

Mitre link : CVE-2026-27496

CVE.ORG link : CVE-2026-27496

JSON object : View

Products Affected

n8n

n8n

CWE

CWE-908

Use of Uninitialized Resource

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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 \u2014 including data from prior requests, tasks, secrets, or tokens \u2014 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."}, {"lang": "es", "value": "n8n es una plataforma de automatizaci\u00f3n de flujos de trabajo de c\u00f3digo abierto. Antes de las versiones 1.123.22, 2.9.3 y 2.10.1, un usuario autenticado con permiso para crear o modificar flujos de trabajo pod\u00eda usar el JavaScript Task Runner para asignar b\u00faferes de memoria no inicializados. Los b\u00faferes no inicializados pueden contener datos residuales del mismo proceso de Node.js \u2014 incluyendo datos de solicitudes anteriores, tareas, secretos o tokens \u2014 lo que resulta en la revelaci\u00f3n de informaci\u00f3n sensible de datos en proceso. Los Task Runners deben habilitarse usando 'N8N_RUNNERS_ENABLED=true'. En modo de ejecutor externo, el impacto se limita a los datos dentro del proceso del ejecutor externo. El problema se ha solucionado en las versiones de n8n 1.123.22, 2.10.1 y 2.9.3. 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