Security and CVE Tracking

This page tracks known vulnerabilities (CVEs) for Apache XMLSchema.

For reporting a new vulnerability, see Apache Security Team.

Apache XMLSchema CVEs

CVE-2026-102495: Apache XMLSchema: Denial of service through unbounded recursion when resolving schema imports and includes
- Severity: Low
- Affected versions:
  - Apache XMLSchema before 2.3.3
- Description:
  Apache XmlSchema doesn't limit how deeply schema imports and includes can be nested, so a malicious schema can make parsing recurse until the stack overflows. This causes 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)
CVE-2026-102496: Apache XMLSchema: Denial of service through deeply nested schema structures
- Severity: Low
- Affected versions:
  - Apache XMLSchema before 2.3.3
- Description:
  Apache XmlSchema doesn't limit how deeply schema structures can be nested when it builds its schema model, so a malicious schema can make parsing recurse until the stack overflows. This causes 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)
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)