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CVE-2025-59842

CVE-2025-59842: JupyterLab LaTeX typesetter links did not enforce `noopener` attribute

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).

For consistency with handling on other links, new versions of JupyterLab will enforce noopener and target=_blank on all links generated by typesetters. The former will harden the resilience of JupyterLab to extensions with lack of secure defaults in link rendering, and the latter will improve user experience by preventing accidental state loss when clicking on links rendered by LaTeX typesetters.

Impact

Since the official LaTeX typesetter extensions for JupyterLab: jupyterlab-mathjax (default), jupyterlab-mathjax2 and jupyterlab-katex do not include the target=_blank, there is no impact for JupyterLab users.

Patches

JupyterLab 4.4.8

Workarounds

No workarounds are necessary.

References

None

(GitHub Advisory)

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CVE-2025-59842

CVE-2025-59842:

N/A

CVSS Score

-

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Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
jupyterlab	pip	<= 4.4.7	4.4.8

Technical Details

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Miggo AI

Root Cause Analysis

The vulnerability, GHSA-vvfj-2jqx-52jm, is a failure to enforce the noopener attribute on links generated by LaTeX typesetters in JupyterLab. This could expose users to reverse tabnabbing attacks if they are using a third-party extension that creates links with target="_blank".

The root cause of the vulnerability is that the rendering pipeline for various content types (HTML, Markdown, etc.) would invoke a LaTeX typesetter if needed, but it did not sanitize the HTML output of the typesetter to ensure that anchor tags (<a>) had the necessary security attributes (rel="noopener").

The patch addresses this issue at multiple levels of the rendering stack:

In the MathJax Extension: The MathJaxTypesetter.typeset method itself is modified to proactively harden the links it generates.
In the Core Renderers: The renderHTML and renderLatex functions in @jupyterlab/rendermime are updated to explicitly call a new hardenAnchorLinks function after the typesetter has run. This fixes a logical flaw where the previous link handling was done before the typesetter had even created the links.
In the Rendering Widgets: The RenderedHTML, RenderedLatex, RenderedMarkdown, and RenderedSVG widgets are all modified. The direct call to the typesetter is replaced with a call to a new Private.typeset helper function, which ensures that hardenAnchorLinks is called after the typesetting is complete, regardless of whether the typesetter runs synchronously or asynchronously.

By patching all these locations, the fix ensures that any links generated by the LaTeX typesetter are properly secured, mitigating the vulnerability across all the different ways content can be rendered in JupyterLab.

Vulnerable functions

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WAF Rule

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Reasoning

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