Arbitrary File Upload Affecting n8n-nodes-base package, versions >=0.123.0 <1.121.3
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Arbitrary File Upload vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-JS-N8NNODESBASE-14894272
- published7 Jan 2026
- disclosed6 Jan 2026
- creditThéo Lelasseux
Introduced: 6 Jan 2026
CVE-2026-21877 (opens in a new tab)How to fix?
Upgrade n8n-nodes-base to version 1.121.3 or higher.
Overview
n8n-nodes-base is a Base nodes of n8n
Affected versions of this package are vulnerable to Arbitrary File Upload via the Git Node. An authenticated user can achieve execution of untrusted code by uploading malicious files that are subsequently executed by the service. This can lead to full compromise of the affected instance.
Workaround
This vulnerability can be mitigated by disabling the Git Node and limiting access for untrusted users.