Critical Stack Buffer Overflow Vulnerability in libxml2 Package
Summary
ALSA-2026:39304: Low: libxml2 security update. Affects libxml2 versions < 2.12.5-10.el10_2.2. Fixed in 2.12.5-10.el10_2.2. How to fix ↓
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Background
libxml2 is a widely used development toolbox that provides the implementation of various XML standards. It is essential for applications that require XML parsing, validation, and manipulation. The library is integral to many software systems, making its security paramount. This vulnerability specifically affects versions of libxml2 prior to 2.12.5-10.el10_2.2, exposing applications to potential security risks.
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 can be exploited by an attacker to execute arbitrary code, potentially leading to unauthorized access or control over the affected system. The vulnerability arises from improper handling of user input, which can overflow the buffer and overwrite adjacent memory, causing unpredictable behavior.
How To Fix
Minimum fixed version
2.12.5-10.el10_2.2
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, users can avoid using the xmllint interactive shell until the package is updated. Additionally, restricting access to the application utilizing libxml2 can mitigate potential exploitation until a patch is applied.
Conclusion
The libxml2 library has a critical vulnerability that can lead to severe security risks if not addressed. Users are strongly advised to update to the latest patched version to safeguard their applications. Utilizing tools like Vulert can help in monitoring for such vulnerabilities effectively.
See every vulnerability recorded for libxml2 →
FAQ
A stack buffer overflow occurs when data exceeds the buffer's allocated size on the stack, leading to overwriting adjacent memory. This can cause crashes or allow attackers to execute arbitrary code.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Simply upload your manifest file like package-lock.json to check for vulnerabilities.
Failing to address this vulnerability can lead to unauthorized access, data breaches, and potential system compromise, putting sensitive information at risk.
Yes, you can automate updates using package management tools like dnf or yum by scheduling regular updates in your system maintenance routine.
Detailed information about CVE-2025-6170 can be found on the official CVE page and through security advisories related to libxml2.
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