CVE-2019-10255: PYSEC-2026-647 - Open Redirect vulnerability in jupyterhub and notebook

CVE-2019-10255 · Severity: low · CVSS 3 · Published 2026-07-02

Open Redirect vulnerability in jupyterhub and notebook

Technologies: jupyterhub (PyPI), notebook (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2019-10255 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2019-10255 being exploited in the wild.
How severe is CVE-2019-10255?
Low severity, with a CVSS score of 3, published 2 July 2026.
Which products and versions are affected?
jupyterhub (PyPI) ECOSYSTEM:introduced=0,fixed=0.9.6; notebook (PyPI) ECOSYSTEM:introduced=0,fixed=5.7.8.
Is there a fix for CVE-2019-10255?
Yes. jupyterhub (PyPI): upgrade to 0.9.6 or later; notebook (PyPI): upgrade to 5.7.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2019-10255?
Check whether you run jupyterhub (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

  • jupyterhub (PyPI): upgrade to 0.9.6 or later
    pip install "jupyterhub>=0.9.6"
  • notebook (PyPI): upgrade to 5.7.8 or later
    pip install "notebook>=5.7.8"

Affected products

  • jupyterhub (PyPI) ECOSYSTEM:introduced=0,fixed=0.9.6
  • notebook (PyPI) ECOSYSTEM:introduced=0,fixed=5.7.8

Identifiers

  • CVE-2019-10255
  • GHSA-rv62-4pmj-xw6h
  • PYSEC-2026-2683
  • PYSEC-2026-647

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