CVE-2019-10856: Open Redirect Vulnerability in Jupyter Notebook
Summary
CVE-2019-10856: Jupyter Notebook open redirect vulnerability. Affects notebook versions < 5.7.8. Fixed in 5.7.8. How to fix ↓
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Background
Jupyter Notebook is an open-source web application that allows users to create and share documents containing live code, equations, visualizations, and narrative text. It is widely used for data analysis, scientific computing, and machine learning tasks. The vulnerability in question, CVE-2019-10856, is a moderate severity issue that affects Jupyter Notebook versions prior to 5.7.8. It involves an open redirect vulnerability that can occur when an empty netloc is present. This vulnerability is a result of an incomplete fix for CVE-2019-10255.
Vulnerability Detail
The open redirect vulnerability in Jupyter Notebook allows an attacker to redirect users to malicious websites by exploiting an empty netloc. By crafting a specially crafted URL, an attacker can trick users into visiting a URL that appears legitimate but actually redirects them to a malicious site. This can be used for phishing attacks, spreading malware, or stealing sensitive information. The vulnerability has a CVSS score of 6.1, indicating a moderate severity level.
How To Fix
Latest published version: 7.6.3 as of 22 Oct 2026
pip install --upgrade "notebook==7.6.3"Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
5.7.8
This is the first release that contains the fix.
pip install --upgrade "notebook==5.7.8"Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Conclusion
The open redirect vulnerability in Jupyter Notebook (CVE-2019-10856) can be mitigated by upgrading to version 5.7.8 or later. It is important to promptly update Jupyter Notebook installations to ensure the security of users' data and protect against potential attacks. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
An open redirect vulnerability is a type of security flaw that allows an attacker to redirect users to a different website, often a malicious one, by manipulating a URL parameter or path.
This vulnerability can be exploited by attackers to trick users into visiting malicious websites, potentially leading to phishing attacks, malware infections, or the theft of sensitive information.
Versions of Jupyter Notebook prior to 5.7.8 are affected by this vulnerability.
No, there is no known workaround for this vulnerability. It is recommended to upgrade to the latest version of Jupyter Notebook.
You can update Jupyter Notebook to the fixed version (5.7.8 or later) by running the command 'pip install --upgrade notebook'.
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