CVE-2026-102497

Apache XMLSchema: Denial of service through cyclic schema definitions in the schema walker

Published Sep 29, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
The Apache XmlSchema walker (xmlschema-walker) doesn't detect cycles in type derivation, substitution groups, model groups or attribute groups. A malicious schema with such a cycle can make the walker recurse until the stack overflows, causing a denial of service.

Users are recommended to upgrade to version 2.3.3, which fixes this issue.

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
CPEs cpe:2.3:a:apache:xmlschema:*:*:*:*:*:*:*:*
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First Time appeared Apache
Apache xmlschema
Vendors & Products Apache
Apache xmlschema
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Weaknesses CWE-400
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Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-400
CWE-674
Type Values Removed Values Added
Description The Apache XmlSchema walker (xmlschema-walker) doesn't detect cycles in type derivation, substitution groups, model groups or attribute groups. A malicious schema with such a cycle can make the walker recurse until the stack overflows, causing a denial of service. Users are recommended to upgrade to version 2.3.3, which fixes this issue.
Title Apache XMLSchema: Denial of service through cyclic schema definitions in the schema walker
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Sep 29, 2026, 8:13 PM
Reserved
Sep 29, 2026, 10:42 AM
Status
Analyzed
Published
Sep 29, 2026, 12:17 PM
Modified
Oct 6, 2026, 2:37 PM