CVE-2026-44181: CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine in jupyter-server enterprise_gateway
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.
AI Analysis
Technical Summary
CVE-2026-44181 is a critical vulnerability in jupyter-server's enterprise_gateway component affecting versions from 2.0.0rc2 up to but not including 3.3.0. The vulnerability is due to improper neutralization of special elements in environment variables (KERNEL_XXX) used in rendering Kubernetes manifests with Jinja2 templates. This Server Side Template Injection (SSTI) allows attackers to execute arbitrary Python code and OS commands within the Enterprise Gateway service. Successful exploitation can lead to theft of Kubernetes service account tokens, enabling attackers to access Kubernetes secrets and fully compromise the cluster by scheduling privileged pods or pods with hostPath volume mounts. The vulnerability is fixed in version 3.3.0.
Potential Impact
Exploitation of this vulnerability allows unauthenticated remote attackers to execute arbitrary code on the Enterprise Gateway service, leading to theft of Kubernetes service account tokens and secrets. This can result in full compromise of the Kubernetes cluster, including the ability to schedule privileged pods or pods with hostPath mounts, potentially leading to complete cluster takeover.
Mitigation Recommendations
Upgrade Jupyter Enterprise Gateway to version 3.3.0 or later, where this vulnerability has been fixed. Patch status is not explicitly stated in vendor advisories but the fix is included in version 3.3.0. Until upgrade, restrict access to the Enterprise Gateway service to trusted users only to reduce risk.
CVE-2026-44181: CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine in jupyter-server enterprise_gateway
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.
CVSS v4.0
Score 10.0critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-44181 is a critical vulnerability in jupyter-server's enterprise_gateway component affecting versions from 2.0.0rc2 up to but not including 3.3.0. The vulnerability is due to improper neutralization of special elements in environment variables (KERNEL_XXX) used in rendering Kubernetes manifests with Jinja2 templates. This Server Side Template Injection (SSTI) allows attackers to execute arbitrary Python code and OS commands within the Enterprise Gateway service. Successful exploitation can lead to theft of Kubernetes service account tokens, enabling attackers to access Kubernetes secrets and fully compromise the cluster by scheduling privileged pods or pods with hostPath volume mounts. The vulnerability is fixed in version 3.3.0.
Potential Impact
Exploitation of this vulnerability allows unauthenticated remote attackers to execute arbitrary code on the Enterprise Gateway service, leading to theft of Kubernetes service account tokens and secrets. This can result in full compromise of the Kubernetes cluster, including the ability to schedule privileged pods or pods with hostPath mounts, potentially leading to complete cluster takeover.
Mitigation Recommendations
Upgrade Jupyter Enterprise Gateway to version 3.3.0 or later, where this vulnerability has been fixed. Patch status is not explicitly stated in vendor advisories but the fix is included in version 3.3.0. Until upgrade, restrict access to the Enterprise Gateway service to trusted users only to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-05T14:39:34.924Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a595c2d68715ace43d0b039
Added to database: 07/16/2026, 22:33:17 UTC
Last enriched: 07/17/2026, 07:59:48 UTC
Last updated: 08/28/2026, 22:52:11 UTC
Views: 97
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.