AI agent vulnerability · n8n

CVE-2026-21877: n8n Vulnerable to RCE via Arbitrary File Write

criticalCVSS 3.1 9.9GHSA-v364-rw7m-3263

Impact n8n is affected by an authenticated Remote Code Execution (RCE) vulnerability. Under certain conditions, an authenticated user may be able to cause untrusted code to be executed by the n8n service. This could result in full compromise of the affected instance. Both self-hosted and n8n Cloud instances are impacted. Patches The issue has been resolved in n8n version 1.121.3.

Published Jan 6, 2026

Affected packages

n8n

Ecosystem: npm
Affected: >= 0.123.0, < 1.121.3
Fixed in: 1.121.3
Check: npm ls n8n

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Impact

n8n is affected by an authenticated Remote Code Execution (RCE) vulnerability.

Under certain conditions, an authenticated user may be able to cause untrusted code to be executed by the n8n service. This could result in full compromise of the affected instance.

Both self-hosted and n8n Cloud instances are impacted.

Patches

The issue has been resolved in n8n version 1.121.3.

Users are advised to upgrade to this version or later to fully address the vulnerability.

Workarounds

If upgrading is not immediately possible, administrators can reduce exposure by disabling the Git node and limiting access for untrusted users.

References

n8n documentation: Blocking access to nodes

Credited to theolelasseux.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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