CVE-2025-59842: jupyter jupyterlab

Vulnerability summary

CVE-2025-59842 is a medium (CVSS 4.3) vulnerability in jupyter jupyterlab. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14% of scored vulnerabilities.

Timeline

1. 26-09-2025
   PublishedVulnerability first disclosed.
2. 26-09-2025
   Last modifiedVulnerability information updated.

Description

jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to version 4.4.8, links generated with LaTeX typesetters in Markdown files and Markdown cells in JupyterLab and Jupyter Notebook did not include the noopener attribute. This is deemed to have no impact on the default installations. Theoretically users of third-party LaTeX-rendering extensions could find themselves vulnerable to reverse tabnabbing attacks if links generated by those extensions included target=_blank (no such extensions are known at time of writing) and they were to click on a link generated in LaTeX (typically visibly different from other links). This issue has been patched in version 4.4.8.

• CWE-1022Use of Web Link to Untrusted Target with window.opener AccessThe web application produces links to untrusted external sites outside of its sphere of control, but it does not properly prevent the external site from modifying security-critical properties of the window.opener object, such as the location property.