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Message-ID: <60806c15-9619-3417-7c7f-d76cd5d055a9@apache.org>
Date: Tue, 29 Sep 2026 11:03:26 +0000
From: Colm O hEigeartaigh <coheigea@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-102497: Apache XMLSchema: Denial of service through
cyclic schema definitions in the schema walker
Severity: low
Affected versions:
- Apache XMLSchema before 2.3.3
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.
Credit:
This issue was found using Claude agents to study the security of open-source projects (finder)
References:
https://ws.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-102497
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