---
title: "CVE-2026-44182: Jupyter Enterprise Gateway: Kubernetes Manifest Injection in Jinja2 Template Rendering"
url: https://erroneo.us/security/cve/CVE-2026-44182/
description: "CVE-2026-44182 (jupyter_enterprise_gateway (PyPI)): Jupyter Enterprise Gateway launches remote Jupyter Notebook kernels across distributed clusters like…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-16
date_modified: 2026-07-17
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-44182"
kev: false
cvss: 10
epss: 0.00632
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-44182: Jupyter Enterprise Gateway: Kubernetes Manifest Injection in Jinja2 Template Rendering

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.6% , percentile 50: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 50% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes jupyter_enterprise_gateway (PyPI) < 3.3.0, fixed in 3.3.0 . Check your lockfile, including transitive dependencies.

## What it is

Jupyter Enterprise Gateway launches remote Jupyter Notebook kernels across distributed clusters like Apache Spark, Kubernetes, and Docker Swarm. In versions prior to 3.3.0, the server interpolates untrusted environment variables (e.g., KERNELXXX) into Kubernetes manifests without YAML-aware escaping, enabling YAML injection attacks. Attackers can inject new fields, overwrite critical fields (e.g., duplicate securityContext keys, where the last one prevails), and inject document boundaries (--- for new documents, ... for end-of-document) to generate multiple resources, potentially creating arbitrary types, such as privileged pods. The Jinja2 template for the Kubernetes manifest contains several kernelxxx variables, such as kernelworkingdir that are used when rendering the manifest and are all vectors for YAML injection. This issue has been fixed in version 3.3.0.

## Affected packages

- PyPI `jupyter_enterprise_gateway` < 3.3.0 → fixed: 3.3.0

## Affected products (CVE record)

- jupyter-server enterprise_gateway: < 3.3.0

## Severity

- GitHub_M CVSS 4.0: 10 `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`
- GitHub CVSS 4.0: 10.0 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.63% probability of exploitation activity in the next 30 days; percentile 50.

## Sources

- [GitHub Advisory GHSA-cfw7-6c5v-2wjq](https://github.com/advisories/GHSA-cfw7-6c5v-2wjq)
- [CVE.org record CVE-2026-44182](https://www.cve.org/CVERecord?id=CVE-2026-44182)
- [NVD entry CVE-2026-44182](https://nvd.nist.gov/vuln/detail/CVE-2026-44182)
- [github.com](https://github.com/jupyter-server/enterprise_gateway/security/advisories/GHSA-cfw7-6c5v-2wjq)
- [github.com](https://github.com/jupyter-server/enterprise_gateway/releases/tag/v3.3.0)

---
Source page: https://erroneo.us/security/cve/CVE-2026-44182/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt