CVE-2025-58146

XAPI UTF-8 string handling

Published Jul 9, 2026 CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Xen
Xen xapi
Vendors & Products Xen
Xen xapi
Type Values Removed Values Added
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.
Title XAPI UTF-8 string handling
Weaknesses CWE-20
References
Metrics cvssV4_0

{'score': 9.4, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
XEN
Published
Updated
Jul 9, 2026, 4:07 PM
Reserved
Aug 26, 2025, 6:48 AM
Status
Deferred
Published
Jul 9, 2026, 4:16 PM
Modified
Sep 29, 2026, 7:10 PM