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Xen CVE-2025-58146

| EUVDEUVD-2025-210446 CRITICAL
Improper Input Validation (CWE-20)
2026-07-09 XEN GHSA-cfmg-797f-j883
Information Disclosure Xen Suse Xapi
Critical
Disputed · 9.4 Vendor: XEN
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Severity by source

Sources disagree (Medium–Critical)
Vendor (XEN) PRIMARY
9.4 CRITICAL
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
SUSE
MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: XEN

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jul 09, 2026 - 16:30 vuln.today

DescriptionCVE.org

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.

  1. 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.

  1. There is no input sanitisation for Map/Set updates on objects in the

XAPI database.

AnalysisAI

Denial-of-service and database-corruption in Xen's XAPI toolstack (the XenAPI management layer used by XCP-ng and Citrix/XenServer Hypervisor) lets clients that submit object updates crash the database event thread or write strings that permanently prevent the database from loading. Three distinct input-validation defects are covered by XSA-474: notifications built from unsanitised input, a UTF-8 encoder that follows Unicode 3.0 while dependent libraries enforce the stricter 3.1 spec, and a total absence of sanitisation for Map/Set object updates. No public exploit has been identified at time of analysis and it is not on CISA KEV; the CVSS 4.0 base score is 9.4.

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Same weakness CWE-20 – Improper Input Validation

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CVE-2021-44228 CRITICAL POC
10.0
CVE-2024-3400 CRITICAL POC
10.0
CVE-2022-47966 CRITICAL POC
9.8
CVE-2023-22515 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2017-9791 CRITICAL POC
9.8
CVE-2017-15944 CRITICAL POC
9.8
CVE-2019-0604 CRITICAL POC
9.8

Same technique Information Disclosure

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CVE-2019-2725 CRITICAL POC
9.8
CVE-2021-34523 CRITICAL POC
9.0
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise Micro 5.3 Not-Affected
SUSE Linux Enterprise Micro 5.4 Not-Affected
SUSE Linux Enterprise Micro 5.5 Not-Affected

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CVE-2025-58146 vulnerability details – vuln.today
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