Critical Stack Buffer Overflow Vulnerability in libxml2 Package
Summary
ALSA-2026:39317: Low: libxml2 security update. Affects libxml2 versions < 2.9.13-14.el9_8.2. Fixed in 2.9.13-14.el9_8.2. How to fix ↓
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Background
libxml2 is a widely-used development toolbox that provides an implementation of various XML standards. It is essential for applications that require XML parsing, validation, and manipulation. The library is integral to many software projects, making its security paramount. The recent vulnerability identified poses a significant risk to systems utilizing this library, particularly in environments where user input is processed.
Vulnerability Detail
The vulnerability, identified as CVE-2025-6170, is a stack buffer overflow in the xmllint interactive shell command handling of the libxml2 library. This flaw allows an attacker to exploit the buffer overflow, potentially leading to arbitrary code execution or a crash of the application. The vulnerability arises from improper handling of user input, which can be manipulated to exceed the allocated buffer size, resulting in memory corruption.
How To Fix
Minimum fixed version
2.9.13-14.el9_8.2
This is the first release that contains the fix.
sudo dnf update libxml2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, avoid using the xmllint interactive shell command until the package is updated. Additionally, validate and sanitize all user inputs to mitigate the risk of exploitation.
Conclusion
The libxml2 library has a critical vulnerability that poses significant risks to applications relying on it. It is crucial to update to the latest patched version to safeguard against potential exploits. Regular monitoring and validation of dependencies are essential for maintaining security.
See every vulnerability recorded for libxml2 →
FAQ
CVE-2025-6170 is a vulnerability in the libxml2 library that allows for a stack buffer overflow, which can lead to arbitrary code execution.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without any signup.
The potential impacts include application crashes, unauthorized access, and execution of arbitrary code, which can compromise system security.
Yes, a patch is available in the form of an updated version of the libxml2 package, specifically version 2.9.13-14.el9_8.2.
If immediate updates are not possible, implement input validation and avoid using the vulnerable features until the update can be applied.
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