A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that can lead libxml to crash, resulting in a denial of service or other possible undefined behavior due to sensitive data being corrupted in memory.
The severity of this vulnerability is classified as critical, with a CVSS score of 9.1. This high score indicates a significant risk to organizations using affected versions of libxml2. Attackers may leverage this vulnerability to disrupt services and potentially access sensitive information.
Due to the potential for denial of service and other harmful outcomes, organizations should prioritize patching immediately. Ensuring that systems using libxml2 are updated can significantly reduce the risk of exploitation.
Currently, there are no known exploits or public proof of concept available for this vulnerability, but the exploitability status is marked critical. Therefore, vigilance is recommended in monitoring systems for any signs of abnormal behavior.
Vulnerability Details
The vulnerability allows for memory corruption through mishandling of specific XML elements. The CVSS score of 9.1 reflects the severity of the impact on confidentiality, integrity, and availability.
The flaw falls under CWE-125, indicating issues of out-of-bounds read or write, which can lead to corruption of memory and undefined behavior.
The vulnerability was published on June 16, 2025, and is currently classified as awaiting analysis. Organizations should remain aware of this vulnerability and take necessary steps to mitigate any risks.
Technical Analysis
The root cause of this vulnerability is a flaw in the processing of XML elements. When certain sch:name elements are processed, it can lead to memory corruption, impacting the availability of the service.
The attack vector is network-based, which means that an attacker can exploit this vulnerability remotely. The attack complexity is low, requiring no special privileges or user interaction, making it easier for attackers to exploit this flaw.
The integrity impact is high, as attackers may manipulate data in memory, while the availability impact is also high, as it can lead to service disruptions.
Risk & Impact Analysis
The real-world deployment risk associated with this vulnerability is significant. Organizations using libxml2 in mission-critical applications must be aware of the potential for service disruption and data integrity issues.
The blast radius is considerable, as memory corruption can affect any system utilizing libxml2, leading to widespread denial of service. The urgency for remediation is critical due to the potential for exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch are affected. Organizations should ensure they are running the latest patched version of libxml2 to mitigate this risk.
Mitigation & Remediation
Patch and update libxml2 to the latest version to address this vulnerability. If immediate patching is not possible, consider implementing configuration hardening measures to limit exposure.
Organizations should also engage in regular security assessments, such as penetration testing, to identify similar weaknesses in their systems.
Detection Guidance
Monitor logs for indicators of abnormal XML processing or crashes in libxml2. Look for behavioral anomalies that may indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its potential to disrupt critical services. As organizations increasingly rely on XML for data interchange, the risk of memory corruption vulnerabilities will continue to grow.
This CVE represents a pattern of vulnerabilities in widely used libraries, highlighting the need for robust security practices and regular updates.
Security teams should take this as a strategic reminder to prioritize vulnerability management and stay informed about emerging threats. Continuous engagement with security best practices, such as regular vulnerability management programs, can help mitigate the risks associated with vulnerabilities like CVE-2025-49796.
Additionally, organizations should consider adopting a proactive approach to security, including integrating security assessments into their development and deployment processes.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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