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Vulnerabilities

Vulnerability · CVE-2026-42266

JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture.

Published May 13, 2026 · catalog updated Aug 28, 2026 · JupyterLab is an extensible

Check if you run it

No confirmed exploitation is on record for CVE-2026-42266. EPSS is 0.85%. Act only if a listed version of JupyterLab is an extensible is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (JupyterLab is an extensible).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.85%
Remediation
Advisory link
Affected products
cpe jupyter/jupyterlab

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe jupyter/jupyterlabversion unspecified

How to fix CVE-2026-42266

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-42266. EPSS is 0.85%. Act only if a listed version of JupyterLab is an extensible is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-602; CWE-88. EPSS 0.85%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 13, 2026 · NIST NVD

    Detected

    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 vulnerabi

  2. Aug 28, 2026 · NIST NVD

    Updated

    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 vulnerabi

Sources

  • CVE.orgVulnerability recordCVE-2026-42266

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-42266

    30-day exploitation probability 0.9%

    first.org
  • NIST NVDVulnerability recordCVE-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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.