CVE-2026-102497

Analyzed Analyzed - Analysis Complete

Apache XmlSchema Walker Stack Overflow via Cyclic Schema

Publication date: 2026-09-29

Last updated on: 2026-10-06

Assigner: Apache Software Foundation

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-29

Last Modified

2026-10-06

Generated

2026-10-19

AI Q&A

2026-09-29

EPSS Evaluated

2026-10-18

NVD

CVE-2026-102497

EUVD

EUVD-2026-88739

Affected Vendors & Products

Vendor	Product	Version / Range
apache	xmlschema	to 2.3.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-674	The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

Attack-Flow Graph

Executive Summary

The Apache XmlSchema walker (xmlschema-walker) fails to detect cycles in schema components like type derivation or substitution groups. A malicious schema with such cycles causes the walker to recurse indefinitely until the stack overflows, leading to a denial of service.

Detection Guidance

This vulnerability can be detected by checking the version of Apache XmlSchema walker in use. If it is below 2.3.3, the system is vulnerable. No specific commands are provided in the context to detect cycles in schemas.

Impact Analysis

This vulnerability can cause system crashes or unresponsiveness if a malicious schema is processed by the xmlschema-walker. It may disrupt services relying on Apache XmlSchema, especially those parsing untrusted schemas.

Compliance Impact

This vulnerability causes a denial of service by triggering stack overflows in the xmlschema-walker component. It does not directly impact data privacy or security controls required by standards like GDPR or HIPAA, as it does not lead to unauthorized data access or disclosure.

Mitigation Strategies

Upgrade Apache XmlSchema walker to version 2.3.3 or later to fix the issue. No other mitigation steps are mentioned in the provided context.

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