Vulnerability in Jupyter Enterprise Gateway
CVE-2026-44181
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.
EPSS: 0.007 (50.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Jupyter Enterprise_gateway — versions 2.0.0
- Jupyter-server Enterprise_gateway — versions >= 2.0.0rc2, < 3.3.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-44181?
- CVE-2026-44181 is a critical-severity vulnerability in Jupyter Enterprise Gateway, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 10.0/10. Published 2026-07-16.
- How severe is CVE-2026-44181?
- Critical severity. CVSS v3 base score is 10.0 out of 10.