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CVE-2025-58146— XAPI UTF-8 string handling

Quick assessment

Affected
Xen XAPI
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xen是Xen开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于XAPI UTF-8 String可能导致致命错误，从而触发拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.14% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen XAPI all affected
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I. Basic Information for CVE-2025-58146

Vulnerability Information
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Vulnerability Title
XAPI UTF-8 string handling
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Xen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是Xen开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于XAPI UTF-8 String可能导致致命错误，从而触发拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xen XAPI all -

II. Public POCs for CVE-2025-58146

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III. Intelligence Information for CVE-2025-58146

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Vendor Advisories for CVE-2025-58146 (1)

Same Patch Batch · Xen · 2026-07-09 · 11 CVEs total

CVE-2026-42486 Multiple RBAC issues in XAPI
CVE-2026-23562 Multiple RBAC issues in XAPI
CVE-2026-23560 Multiple RBAC issues in XAPI
CVE-2026-23561 Multiple RBAC issues in XAPI
CVE-2026-23559 Multiple RBAC issues in XAPI
CVE-2026-23556 oxenstored keeps quota related use counts across domain destruction
CVE-2025-58151 varstored: TOCTOU issues with mapped guest memory
CVE-2025-27464 WinPVDrivers: Excessive permissions on user-exposed devices
CVE-2025-27462 WinPVDrivers: Excessive permissions on user-exposed devices
CVE-2025-27463 WinPVDrivers: Excessive permissions on user-exposed devices

IV. Related Vulnerabilities

Same product: XAPI
Same vendor: Xen
Same weakness: CWE-20

V. Comments for CVE-2025-58146

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