jupyter-server Enterprise Gateway up to 3.2.x Kubernetes Manifest Renderer special elements used in a template engine

Summaryinfo

A vulnerability described as problematic has been identified in jupyter-server Enterprise Gateway up to 3.2.x. This affects an unknown part of the component Kubernetes Manifest Renderer. Executing a manipulation can lead to improper neutralization of special elements used in a template engine. This vulnerability appears as CVE-2026-44182. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in jupyter-server Enterprise Gateway up to 3.2.x and classified as problematic. This vulnerability affects an unknown code block of the component Kubernetes Manifest Renderer. The manipulation with an unknown input leads to a improper neutralization of special elements used in a template engine vulnerability. The CWE definition for the vulnerability is CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-44182 since 05/05/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1221 by the MITRE ATT&CK project.

Upgrading to version 3.3.0 eliminates this vulnerability.

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Productinfo

Vendor

• jupyter-server

Name

• Enterprise Gateway

Version

• 3.0
• 3.1
• 3.2

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CPE 2.2info

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