CVE-2025-59842: 
JupyterLab vulnerability analysis and mitigation

JupyterLab, an extensible environment for interactive computing, was found to have a security vulnerability (CVE-2025-59842) in versions prior to 4.4.8. The vulnerability relates to links generated with LaTeX typesetters in Markdown files and Markdown cells that did not include the noopener attribute. This issue was discovered and disclosed on September 26, 2025, affecting JupyterLab and Jupyter Notebook installations (GitHub Advisory, NVD).

The vulnerability is classified as CWE-1022 (Use of Web Link to Untrusted Target with window.opener Access). It received a CVSS v4.0 base score of 2.1 (Low severity) with the vector string CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. The issue specifically involves links generated by LaTeX typesetters that lack proper security attributes, potentially exposing users to reverse tabnabbing attacks under specific conditions (GitHub Advisory).

The vulnerability's impact is considered low, particularly because it has no effect on default installations. The potential risk only exists for users of third-party LaTeX-rendering extensions that include target=_blank in their link generation, though no such extensions were known at the time of disclosure. If exploited, it could potentially lead to reverse tabnabbing attacks when users click on LaTeX-generated links (GitHub Advisory).

The vulnerability has been patched in JupyterLab version 4.4.8. The fix enforces noopener and target=_blank attributes on all links generated by typesetters, improving security against potential reverse tabnabbing attacks. No workarounds are necessary for users who update to the patched version. The official LaTeX typesetter extensions (jupyterlab-mathjax, jupyterlab-mathjax2, and jupyterlab-katex) are not affected by this vulnerability (GitHub Advisory).