---
id: CVE-2026-102497
title: >-
  The Apache XmlSchema walker (xmlschema-walker) doesn't detect cycles in type
  derivation, substitution groups, model groups or attribute groups
summary: >-
  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, c…
severity: none
vendor: Apache Software Foundation
product: 'org.apache.ws.xmlschema:xmlschema-walker'
affected:
  - 'org.apache.ws.xmlschema:xmlschema-walker < 2.3.3'
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T13:17:50.827'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102497'
references:
  - url: 'https://lists.apache.org/thread/1cj02tobjyhjqq723bvg78yxkqt1lk7k'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/09/29/17'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-29T12:33:37.292Z'
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.