CVE-2025-58146 in Xen
Summary
by MITRE • 07/09/2026
There are multiple issues.
1. Updates to the XAPI database sanitise input strings, but try generating the notification using the unsanitised input. This causes the database's event thread to terminate and cease further processing.
2. XAPI's UTF-8 encoder implements v3.0 of the Unicode spec, but XAPI uses libraries which conform to the stricter v3.1 of the Unicode spec. This causes some strings to be accepted as valid UTF-8 by XAPI, but rejected by other libraries in use. Notably, such strings can be entered into the database, after which the database can no longer be loaded.
3. There is no input sanitisation for Map/Set updates on objects in the XAPI database.
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Analysis
by VulDB Data Team • 07/09/2026
The vulnerabilities described in this XAPI database system represent a cascade of security flaws that fundamentally compromise data integrity and system stability. The first issue involves inconsistent input sanitization practices where database updates properly sanitize input strings but fail to apply the same sanitization when generating notifications using the original unsanitized input. This creates a critical race condition where the event processing thread terminates abruptly, leading to complete cessation of further database operations and potential data loss during critical processing periods. The flaw demonstrates poor defensive programming practices and violates the principle of least privilege by allowing malformed input to propagate through different system components.
The second vulnerability stems from Unicode specification version conflicts within the XAPI ecosystem, creating a dangerous compatibility gap between the UTF-8 encoder implementation and external libraries. When the system accepts strings according to Unicode v3.0 specifications but other components strictly enforce v3.1 requirements, it creates a scenario where valid data enters the database but becomes irretrievable due to format incompatibilities. This type of issue falls under CWE-116 improper encoding handling and represents a classic case of specification drift that can lead to persistent data corruption. The consequence is that once problematic strings are stored in the database, the entire system becomes unusable as it cannot load the corrupted data, effectively creating a denial-of-service condition that impacts all database operations.
The third vulnerability addresses a critical gap in input validation for Map/Set updates within XAPI database objects, representing a complete absence of sanitization controls for these specific data structures. This flaw allows malicious actors to inject malformed or unexpected data into object configurations that may not be properly validated before being processed or stored. Such unchecked modifications can lead to arbitrary code execution, privilege escalation, or complete system compromise depending on the implementation details of how these Map/Set structures are utilized within the database architecture. The vulnerability aligns with ATT&CK technique T1059.007 for command and script injection through improper input validation and represents a fundamental failure in data validation that undermines the integrity of the entire database management system.
These vulnerabilities collectively demonstrate a pattern of insufficient input validation and inconsistent security controls throughout the XAPI database infrastructure. The combination of thread termination due to unsanitized inputs, Unicode specification conflicts causing permanent data corruption, and complete lack of sanitization for Map/Set operations creates multiple attack vectors that can be exploited individually or in combination. Organizations should implement comprehensive input validation frameworks, maintain strict consistency across Unicode specifications, and establish robust sanitization protocols for all database operations including Map/Set updates to prevent similar issues from occurring in the future.
The technical impact of these vulnerabilities extends beyond immediate system instability to encompass potential data breaches, service disruption, and complete system compromise. The inconsistent sanitization approach creates exploitable conditions where attackers can cause denial-of-service through thread termination while simultaneously introducing data corruption that renders the entire database unusable. From a security perspective, this represents a failure in the principle of defense in depth, as multiple layers of protection have been bypassed or implemented incorrectly. The vulnerabilities should be prioritized for immediate remediation with comprehensive testing to ensure that all input pathways through the XAPI system are properly sanitized and validated according to established security standards and industry best practices.
The root causes of these issues highlight systemic problems in software development practices including inadequate code review processes, insufficient security testing, and poor dependency management. The Unicode version mismatch specifically demonstrates the importance of maintaining consistency across all system components when dealing with internationalization and encoding standards. Organizations must implement strict governance over library dependencies and ensure that all system components conform to the same specifications to prevent similar compatibility issues from arising in production environments.
The recommended mitigations involve implementing comprehensive input sanitization at multiple levels including database entry points, notification generation processes, and Map/Set update handlers. The Unicode specification conflict requires immediate alignment of all components to use identical Unicode versions or implementation of proper conversion mechanisms between different specifications. Additionally, the system should incorporate automated testing for data integrity validation and implement proper error handling that prevents thread termination due to malformed input while maintaining system stability. These measures align with NIST SP 800-53 security controls and should be implemented as part of a comprehensive vulnerability remediation strategy to ensure long-term system integrity and security posture maintenance.