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Description

jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 4.0.0 to 4.5.6, the allow-list of extensions that can be installed from PyPI Extension Manager (allowed_extensions_uris) is not correctly enforced by JupyterLab. The PyPI Extension Manager was not contained to packages listed on the default PyPI index. This vulnerability is fixed in 4.5.7.

PUBLISHED Reserved 2026-04-26 | Published 2026-05-13 | Updated 2026-05-14 | Assigner GitHub_M




HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

CWE-602: Client-Side Enforcement of Server-Side Security

Product status

>= 4.0.0, < 4.5.7
affected

References

github.com/...terlab/security/advisories/GHSA-37w4-hwhx-4rc4

cve.org (CVE-2026-42266)

nvd.nist.gov (CVE-2026-42266)

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