Critical Stack Buffer Overflow in libxml2: Security Update Required
Summary
ALSA-2026:36734: Low: libxml2 security update. Affects libxml2 versions < 2.9.7-21.el8_10.6. Fixed in 2.9.7-21.el8_10.6. How to fix ↓
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Background
libxml2 is a widely-used development toolbox that implements various XML standards, providing essential functionalities for XML parsing and manipulation. It is integral to many applications that rely on XML data processing. However, vulnerabilities in this library can expose applications to severe security risks, particularly when handling untrusted XML input.
Vulnerability Detail
The vulnerability identified as CVE-2025-6170 is a stack buffer overflow that occurs in the xmllint interactive shell command handling of libxml2. This flaw allows attackers to exploit the buffer overflow, potentially leading to arbitrary code execution or application crashes. The vulnerability arises from improper handling of user input, making it critical for developers to address it promptly to safeguard their applications.
How To Fix
Minimum fixed version
2.9.7-21.el8_10.6
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, it is advisable to avoid using the xmllint interactive shell until the package is updated. Additionally, validate and sanitize any XML input to mitigate the risk of exploitation.
Conclusion
The libxml2 library has a critical vulnerability (CVE-2025-6170) that requires immediate attention. By updating to the latest patched version, developers can protect their applications from potential exploits. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
See every vulnerability recorded for libxml2 →
FAQ
CVE-2025-6170 is a vulnerability in the libxml2 library that allows for a stack buffer overflow, potentially leading to arbitrary code execution.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.
Failing to address this vulnerability could allow attackers to execute arbitrary code, leading to data breaches, system compromise, or application crashes.
Yes, a patch is available in the form of an updated version of libxml2 (2.9.7-21.el8_10.6) that addresses this vulnerability.
If an immediate update is not possible, avoid using the affected features and ensure that all XML inputs are properly validated and sanitized.
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