Stack-Based Buffer Overflow in libxml2: Critical Vulnerability Overview
Summary
DEBIAN-CVE-2025-24928: libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a stack-based buffer overflow in xmlSnprintfElements in valid.c. Affects libxml2 versions < 2.9.10+dfsg-6.7+deb11u6. Fixed in 2.9.10+dfsg-6.7+deb11u6. 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 speed and efficiency, making it a popular choice among developers for applications that require XML handling. However, like any software, it is not immune to vulnerabilities. The recent discovery of a stack-based buffer overflow in libxml2 versions prior to 2.12.10 and 2.13.x before 2.13.6 poses a significant risk, particularly when handling untrusted documents or DTDs.
Vulnerability Detail
The vulnerability arises from a stack-based buffer overflow in the xmlSnprintfElements function located in valid.c. This flaw can be exploited when DTD validation is performed on untrusted documents or DTDs, potentially allowing an attacker to execute arbitrary code or crash the application. This vulnerability is similar to CVE-2017-9047, indicating a recurring issue in the library's handling of XML validation.
How To Fix
Minimum fixed version
2.9.10+dfsg-6.7+deb11u6
This is the first release that contains the fix.
sudo apt-get install --only-upgrade libxml2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, avoid using DTD validation on untrusted documents or DTDs until the package is updated. This can help mitigate the risk of exploitation until a proper fix is applied.
Conclusion
The stack-based buffer overflow vulnerability in libxml2 is a critical issue that requires immediate attention. By updating to the latest patched versions of the library, users can protect their applications from potential exploits. It is essential to remain vigilant and utilize tools like Vulert to monitor for vulnerabilities in open-source software.
See every vulnerability recorded for libxml2 →
FAQ
libxml2 is an XML parsing library that provides tools for reading, manipulating, and writing XML documents efficiently.
A stack-based buffer overflow occurs when data exceeds the buffer's allocated size on the stack, potentially leading to code execution or application crashes.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Simply upload your manifest file, like package-lock.json, to check for vulnerabilities.
If an immediate update is not possible, avoid using DTD validation on untrusted documents or DTDs as a temporary measure.
Detailed information can be found in the Debian CVE database or by visiting the Vulert website for real-time monitoring of vulnerabilities.
References
Related vulnerabilities
Recent vulnerabilities recorded for libxml2.
