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    CVE-2026-42266

    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:May 13, 2026
    Last Modified:Aug 28, 2026
    EPS:May 13, 2026
    EPSS Score:0.00554
    CVSS Score:8.8

    Affected Products

    Vendor
    Jupyter
    Product
    Jupyterlab

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-137 Parameter Injection
    CAPEC-162 Manipulating Hidden Fields
    CAPEC-174 Flash Parameter Injection
    CAPEC-202 Create Malicious Client
    CAPEC-207 Removing Important Client Functionality
    CAPEC-208 Removing/short-circuiting 'Purse' logic: removing/mutating 'cash' decrements
    CAPEC-21 Exploitation of Trusted Identifiers
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-383 Harvesting Information via API Event Monitoring
    CAPEC-384 Application API Message Manipulation via Man-in-the-Middle
    CAPEC-385 Transaction or Event Tampering via Application API Manipulation
    CAPEC-386 Application API Navigation Remapping
    CAPEC-387 Navigation Remapping To Propagate Malicious Content
    CAPEC-388 Application API Button Hijacking
    CAPEC-41 Using Meta-characters in E-mail Headers to Inject Malicious Payloads
    CAPEC-460 HTTP Parameter Pollution (HPP)
    CAPEC-88 OS Command Injection

    Related CVEs

    CVE-2026-73417 (CVSS 8.6) — jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Noteb…
    CVE-2026-73416 (CVSS 6.1) — jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Noteb…
    CVE-2026-73627 (CVSS 6) — JupyterLab (pip package 'jupyterlab') versions >=4.1.0,<=4.5.9 and >=4.6.0,<=4.6.1 contain a plugin manager lo…
    CVE-2026-73626 (CVSS 7.7) — JupyterLab versions >=4.6.0,<=4.6.1 and <=4.5.9 contain an allowlist/blocklist enforcement gap in PyPIExtensio…
    CVE-2026-73415 (CVSS 7.5) — jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Noteb…
    CVE-2026-67338 (CVSS 5.1) — JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fai…
    CVE-2026-54528 (CVSS 7.1) — JupyterLab Git is a Git extension for JupyterLab. Prior to 0.54.0, jupyterlab-git uses fnmatch.fnmatchcase() i…
    CVE-2026-54527 (CVSS 9.3) — JupyterLab Git is a Git extension for JupyterLab. From 0.30.0b3 before 0.54.0, the PlainTextDiff.ts createHead…
    CVE-2026-42557 (CVSS 8.6) — jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Noteb…
    CVE-2026-40171 (CVSS 8.4) — In Jupyter Notebook versions 7.0.0 through 7.5.5, JupyterLab versions 4.5.6 and earlier, and the corresponding…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High