Buffer Overflow Vulnerability in libxml2: Potential Information Disclosure
Summary
UBUNTU-CVE-2025-26434: In libxml2, there is a possible out of bounds read due to a buffer overflow. Affects libxml2 versions 2.9.1+dfsg1-3ubuntu2 – 2.9.1+dfsg1-3ubuntu4.9. No fix is published. How to fix ↓
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Background
libxml2 is a widely used XML parsing library that provides a range of functionalities for processing XML documents. It is known for its performance and compliance with standards. However, a recent vulnerability has been identified that could lead to local information disclosure due to a buffer overflow, affecting various versions of the library across multiple Ubuntu LTS distributions.
Vulnerability Detail
In libxml2, there exists a possible out of bounds read caused by a buffer overflow. This vulnerability can lead to local information disclosure without requiring additional execution privileges. The issue arises from improper handling of input data, which can allow an attacker to read sensitive information from memory. User interaction is not necessary for exploitation, making it a significant risk for systems using affected versions of the library.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can limit access to the affected library or implement input validation to mitigate the risk of exploitation until the library is updated.
Conclusion
The identified buffer overflow vulnerability in libxml2 poses a risk of local information disclosure. It is crucial for users to update their installations to the latest patched versions to mitigate this risk. Utilizing tools like Vulert can help in monitoring and identifying vulnerabilities in your software.
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FAQ
The CVSS score of this vulnerability is 5.5, indicating a medium severity level.
Affected versions include libxml2 versions 2.9.1, 2.9.3, 2.9.4, 2.9.10, 2.9.13, and 2.9.14 across various Ubuntu LTS distributions.
No, user interaction is not needed for exploitation, making it a more serious risk.
You can use Vulert, which monitors open-source vulnerabilities in your software. By uploading a manifest file like package-lock.json, you can check if your application is affected without requiring installation.
If an immediate update is not possible, consider implementing input validation or restricting access to the library as a temporary measure.
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