Critical Security Update for python-h2: Addressing CVE-2025-57804
Summary
DLA-4290-1: python-h2 - security update. Affects python-h2 versions < 4.0.0-3+deb11u1. Fixed in 4.0.0-3+deb11u1. How to fix ↓
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Background
python-h2 is a Python library that implements the HTTP/2 protocol, enabling efficient communication between clients and servers. It is widely used in web applications to enhance performance and reduce latency. However, vulnerabilities in this library can lead to severe security risks, including data exposure and denial of service.
Vulnerability Detail
CVE-2025-57804 is a security vulnerability identified in python-h2, which could allow attackers to exploit weaknesses in the HTTP/2 protocol implementation. This vulnerability may lead to unauthorized access to sensitive data or service disruptions, potentially affecting the integrity and availability of applications relying on this library.
How To Fix
Minimum fixed version
4.0.0-3+deb11u1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade python-h2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate updating is not feasible, consider temporarily disabling HTTP/2 support in your application until the package can be updated. This can often be done in the server configuration settings, depending on the web server in use.
Conclusion
The vulnerability CVE-2025-57804 in the python-h2 library poses significant security risks. It is crucial to update to the patched version 4.0.0-3+deb11u1 to mitigate these risks. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
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FAQ
CVE-2025-57804 is a security vulnerability in the python-h2 library that could allow attackers to exploit weaknesses in the HTTP/2 protocol.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Failing to address this vulnerability could lead to unauthorized access to sensitive data and potential service disruptions.
Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities in your software using just a manifest file like package-lock.json.
Consider disabling HTTP/2 support in your application as a temporary measure until you can apply the necessary updates.
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