CVE-2026-44181: Jupyter Enterprise Gateway: Unauthorized Access to Kubernetes Cluster

Summary

The Jupyter Enterprise Gateway allows malicious users to execute code and access sensitive Kubernetes data, potentially compromising the entire cluster. This vulnerability affects any organization using the Jupyter Enterprise Gateway with Kubernetes. To protect your cluster, update the Jupyter Enterprise Gateway to the latest version and restrict access to sensitive environment variables.

What to do

Update jupyter_enterprise_gateway to version 3.3.0.

Affected software

Ecosystem	Vendor	Product	Affected versions
pip	–	jupyter_enterprise_gateway	>= 2.0.0rc2, < 3.3.0 Fix: upgrade to 3.3.0
–	jupyter-server	enterprise_gateway	>= 2.0.0rc2, < 3.3.0

Original title

Jupyter Enterprise Gateway launches remote Jupyter Notebook kernels across distributed clusters like Apache Spark, Kubernetes, and Docker Swarm. In versions 2.0.0rc2 and above, prior to 3.3.0, the ...

Original description

Jupyter Enterprise Gateway launches remote Jupyter Notebook kernels across distributed clusters like Apache Spark, Kubernetes, and Docker Swarm. In versions 2.0.0rc2 and above, prior to 3.3.0, the environment variables (KERNEL_XXX) used during the rendering of the Kubernetes manifest are vulnerable to Server Side Template Injection (SSTI). By including Jinja2 template expressions it is possible to execution Python code and OS Commands in the Enterprise Gateway service. The code can use or steal the Kubernetes service account token, which can steal Kubernetes secrets and be used to fully compromise the Kubernetes cluster by scheduling a privileged pod or a pod with a hostPath volume mount. This issue has been fixed in version 3.3.0.

ghsa CVSS4.0 10.0

Vulnerability type

CWE-1336