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
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | jupyterlab | < 4.4.8 | 4.4.8 |
References
- https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vvfj-2jqx-52jm
- https://nvd.nist.gov/vuln/detail/CVE-2025-59842
- https://github.com/jupyterlab/jupyterlab/commit/88ef373039a8cc09f27d3814382a512d9033675c
- https://github.com/jupyterlab/jupyterlab
- https://pypi.org/project/jupyterlab
- https://github.com/advisories/GHSA-vvfj-2jqx-52jm
- CVSS vector
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- Weakness (CWE)
CWE-1022- Platform
- Python (PyPI)
- Package
jupyterlab- Disclosed
- 26.09.2025
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1482 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-vvfj-2jqx-52jm - CC BY 4.0
Vulnerability history: jupyterlab
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 19
- First → latest
- 08.2021 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 8
- Medium 8
- Low 2
Disclosures per year
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 4
- 2025: 1
- 2026: 13
-
JupyterLab LaTeX typesetter links did not enforce `noopener` attribute this entry
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