CVE-2026-44181
published 2026-07-16CVE-2026-44181: Jupyter Enterprise Gateway launches remote Jupyter Notebook kernels across distributed clusters like Apache Spark, Kubernetes, and Docker Swarm. In versions…
PriorityP268critical10CVSS 3.1
AVNACLPRNUINSCCHIHAH
EPSS
0.77%
53.7th percentile
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.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| jupyter-server | enterprise_gateway | — | — |
| jupyter | enterprise_gateway | — | — |
| jupyter | enterprise_gateway | — | — |
| jupyter | enterprise_gateway | >= 2.1.0 < 3.3.0 | 3.3.0 |
CVSS provenance
nvdv3.110.0CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
nvdv4.010.0CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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VulDB
Jupyter Server Enterprise Gateway up to 3.2.x Kubernetes Manifest Renderer KERNEL_XXX special elements used in a template engine
vuldb·2026-07-17·CVSS 10.0
CVE-2026-44181 [CRITICAL] Jupyter Server Enterprise Gateway up to 3.2.x Kubernetes Manifest Renderer KERNEL_XXX special elements used in a template engine
A vulnerability labeled as critical has been found in Jupyter Server Enterprise Gateway up to 3.2.x. Affected by this vulnerability is an unknown functionality of the component Kubernetes Manifest Renderer. Such manipulation of the argument KERNEL_XXX leads to improper neutralization of special elements used in a template engine.
This vulnerability is documented as CVE-2026-44181. The attack can be executed remotely. There is not any exploit available.
GHSA
Jupyter Enterprise Gateway: Jinja2 Template Server Side Template Injection resulting in Remote Code Execution
ghsa·2026-06-03
CVE-2026-44181 [CRITICAL] CWE-1336 Jupyter Enterprise Gateway: Jinja2 Template Server Side Template Injection resulting in Remote Code Execution
Jupyter Enterprise Gateway: Jinja2 Template Server Side Template Injection resulting in Remote Code Execution
### Summary
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.
### Details
The `KERNEL_POD_NAME` variable is rendered using Jinja2, allowing for code execution via template expression statements, in this code:
https://github.com
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-07-16
Published