CVE-2026-44181Jupyter Enterprise Gateway: Jinja2 Template Server Side Template Injection results in Remote Code Execution
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.
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 10.0 | CRITICAL | 4.0GitHub_M (CNA) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
| 10.0 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Details
- CVE ID
- CVE-2026-44181
- Status
- Analyzed
- Assigner (CNA)
- GitHub_M
- Published
- Jul 16, 2026
- Last modified
- 2026-10-24 20:10 UTC
- Weaknesses
- CWE-1336 · Improper Neutralization of Special Elements Used in a Template Engine
Affected Products
As published by the CNA in the CVE record.
jupyter-serverenterprise_gateway1 version range
- >= 2.0.0rc2, < 3.3.0