CVE-2019-9644: PYSEC-2026-2531 - Improper Neutralization of Input During Web Page Generation in Jupyter Notebook

CVE-2019-9644 · Severity: low · CVSS 3 · Published 2026-07-09

Improper Neutralization of Input During Web Page Generation in Jupyter Notebook

Technologies: notebook (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2019-9644 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2019-9644 being exploited in the wild.
How severe is CVE-2019-9644?
Low severity, with a CVSS score of 3, published 9 July 2026.
Which products and versions are affected?
jupyter-notebook (PyPI) ECOSYSTEM:introduced=0,fixed=5.7.6; notebook (PyPI) ECOSYSTEM:introduced=0,fixed=5.7.6.
Is there a fix for CVE-2019-9644?
Yes. jupyter-notebook (PyPI): upgrade to 5.7.6 or later; notebook (PyPI): upgrade to 5.7.6 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2019-9644?
Check whether you run jupyter-notebook (PyPI) or notebook (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • jupyter-notebook (PyPI): upgrade to 5.7.6 or later
    pip install "jupyter-notebook>=5.7.6"
  • notebook (PyPI): upgrade to 5.7.6 or later
    pip install "notebook>=5.7.6"

Affected products

  • jupyter-notebook (PyPI) ECOSYSTEM:introduced=0,fixed=5.7.6
  • notebook (PyPI) ECOSYSTEM:introduced=0,fixed=5.7.6

Identifiers

  • CVE-2019-9644
  • GHSA-hhx8-cr55-qcxx
  • PYSEC-2019-159
  • PYSEC-2026-2531

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