Vulnerability in Jupyter Enterprise Gateway
CVE-2026-44182
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., KERNEL_XXX) 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 kernel_xxx variables, such as kernel_working_dir that are used when rendering the manifest and are all vectors for YAML injection. This issue has been fixed in version 3.3.0.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (49.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Jupyter Enterprise Gateway
- Jupyter-Server Enterprise Gateway — versions < 3.3.0
Weakness classification (CWE)
References
- github.com/jupyter-server/enterprise_gateway/security/advisories/GHSA-cfw7-6c5v… (Exploit, Vendor Advisory)
- github.com/jupyter-server/enterprise_gateway/releases/tag/v3.3.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-44182?
- CVE-2026-44182 is a critical-severity vulnerability in Jupyter Enterprise Gateway, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 10.0/10. Published 2026-07-16.
- How severe is CVE-2026-44182?
- Critical severity. CVSS v3 base score is 10.0 out of 10.