CVE-2026-73626
Description
A flaw was found in JupyterLab where a missing 'await' in the PyPIExtensionManager.install() function could lead to an allowlist/blocklist enforcement gap. This vulnerability allows direct callers of install() to bypass security checks, potentially enabling the installation of unauthorized extensions. This issue affects deployments where a custom extension or downstream integration calls install() directly with untrusted input, an allowlist/blocklist is configured, and the PyPI Extension Manager is enabled.
Statement
This is a Low impact flaw in JupyterLab where an allowlist bypass can occur in specific deployments. Exploitation requires a custom extension or downstream integration to directly call PyPIExtensionManager.install() with untrusted input, alongside a configured allowlist/blocklist, an enabled PyPI Extension Manager, and disabled or delegated kernels and terminals. Standard JupyterLab interfaces are not affected.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 0 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | None | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
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