CVE-2025-58146: CWE-20 Improper input validation in Xen XAPI
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.
AI Analysis
Technical Summary
This vulnerability in Xen XAPI arises from improper input validation (CWE-20). First, while input strings are sanitized before database updates, notifications are generated using unsanitised input, causing the database event thread to terminate and stop processing. Second, XAPI's UTF-8 encoder uses Unicode v3.0, but other libraries use the stricter v3.1, allowing some strings to be accepted by XAPI but rejected elsewhere, which can corrupt the database and prevent it from loading. Third, there is no input sanitisation for Map/Set updates on database objects, potentially allowing malformed data to be introduced. These issues collectively can cause denial of service by disrupting database functionality.
Potential Impact
The vulnerability can cause the XAPI database event thread to terminate unexpectedly, halting further event processing. Additionally, inconsistent UTF-8 validation can lead to database corruption or failure to load the database. Lack of sanitisation in Map/Set updates may allow malformed data insertion, further destabilizing the system. Overall, these issues can result in denial of service and loss of database availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid inputting untrusted or malformed data into the XAPI database. Monitor vendor channels for updates and apply patches promptly once released.
CVE-2025-58146: CWE-20 Improper input validation in Xen XAPI
Description
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.
CVSS v4.0
Score 9.4critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Xen XAPI arises from improper input validation (CWE-20). First, while input strings are sanitized before database updates, notifications are generated using unsanitised input, causing the database event thread to terminate and stop processing. Second, XAPI's UTF-8 encoder uses Unicode v3.0, but other libraries use the stricter v3.1, allowing some strings to be accepted by XAPI but rejected elsewhere, which can corrupt the database and prevent it from loading. Third, there is no input sanitisation for Map/Set updates on database objects, potentially allowing malformed data to be introduced. These issues collectively can cause denial of service by disrupting database functionality.
Potential Impact
The vulnerability can cause the XAPI database event thread to terminate unexpectedly, halting further event processing. Additionally, inconsistent UTF-8 validation can lead to database corruption or failure to load the database. Lack of sanitisation in Map/Set updates may allow malformed data insertion, further destabilizing the system. Overall, these issues can result in denial of service and loss of database availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, avoid inputting untrusted or malformed data into the XAPI database. Monitor vendor channels for updates and apply patches promptly once released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- XEN
- Date Reserved
- 2025-08-26T06:48:41.443Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4fbf4768715ace439fdcf6
Added to database: 07/09/2026, 15:33:27 UTC
Last enriched: 07/09/2026, 15:49:12 UTC
Last updated: 07/10/2026, 02:25:38 UTC
Views: 7
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