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CVE-2025-49795: Null Pointer Dereference Vulnerability in libxml2

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Overview

The CVE-2025-49795 is a major vulnerability found within libxml2, an XML parsing library commonly used in information systems and web services. The vulnerability, a NULL pointer dereference, can be exploited to trigger a denial of service attack, potentially compromising systems or leading to data leakage.

Vulnerability Summary

CVE ID: CVE-2025-49795
Severity: High (7.5 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service; possible system compromise and data leakage

Affected Products

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Product | Affected Versions

libxml2 | All versions up to the latest patch

How the Exploit Works

The vulnerability exists within the XPath processing module of the libxml2 library. An attacker can craft a malicious XML input designed to cause a NULL pointer dereference when parsed by libxml2. This results in a service disruption, causing a denial of service. If the attacker’s input is crafted with precise knowledge of the system’s memory layout, it could potentially even lead to arbitrary code execution.

Conceptual Example Code

POST /xml/parse HTTP/1.1
Host: target.example.com
Content-Type: application/xml
<root>
<exploit>{{NULL_POINTER}}</exploit>
</root>

In this conceptual example, the attacker sends a POST request to a vulnerable endpoint, embedding the malicious payload within the XML data. The payload, represented here symbolically as {{NULL_POINTER}}, is designed to trigger the NULL pointer dereference in libxml2.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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