CVE-2026-44181
Jupyter Enterprise Gateway: Jinja2 Template Server Side Template Injection results in Remote Code Execution
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.
INFO
Published Date :
July 16, 2026, 11:16 p.m.
Last Modified :
Aug. 5, 2026, 3:55 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update Jupyter Enterprise Gateway to version 3.3.0 or later.
- Review and restrict environment variables used.
- Validate Kubernetes manifest rendering process.
- Harden Kubernetes service account permissions.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-44181.
| URL | Resource |
|---|---|
| https://github.com/jupyter-server/enterprise_gateway/releases/tag/v3.3.0 | Product Release Notes |
| https://github.com/jupyter-server/enterprise_gateway/security/advisories/GHSA-f49j-v924-fx9w | Exploit Vendor Advisory |
| https://github.com/jupyter-server/enterprise_gateway/security/advisories/GHSA-f49j-v924-fx9w | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-44181 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-44181
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-44181 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-44181 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 05, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:jupyter:enterprise_gateway:*:*:*:*:*:*:*:* versions from (including) 2.1.0 up to (excluding) 3.3.0 *cpe:2.3:a:jupyter:enterprise_gateway:2.0.0:-:*:*:*:*:*:* *cpe:2.3:a:jupyter:enterprise_gateway:2.0.0:rc2:*:*:*:*:*:* Added Reference Type GitHub, Inc.: https://github.com/jupyter-server/enterprise_gateway/releases/tag/v3.3.0 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/jupyter-server/enterprise_gateway/security/advisories/GHSA-f49j-v924-fx9w Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/jupyter-server/enterprise_gateway/security/advisories/GHSA-f49j-v924-fx9w Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 17, 2026
Action Type Old Value New Value Added Reference https://github.com/jupyter-server/enterprise_gateway/security/advisories/GHSA-f49j-v924-fx9w Added SSVC {'id': 'CVE-2026-44181', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-17T14:04:32.784412Z'} -
New CVE Received by [email protected]
Jul. 16, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'jupyter-server', 'product': 'enterprise_gateway', 'versions': [{'status': 'affected', 'version': '>= 2.0.0rc2, < 3.3.0'}]}] Added 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. Added CVSS V4.0 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 Added CWE CWE-1336 Added Reference https://github.com/jupyter-server/enterprise_gateway/releases/tag/v3.3.0 Added Reference https://github.com/jupyter-server/enterprise_gateway/security/advisories/GHSA-f49j-v924-fx9w