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Apache XmlSchema EUVDEUVD-2026-88739

| CVE-2026-102497 HIGH
Uncontrolled Recursion (CWE-674)
2026-09-29 apache GHSA-9wgm-rwmh-4mcv
Denial Of Service Apache Java Apache Software Foundation Apache Xmlschema
7.5
CVSS 3.1 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
7.5 LOW
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Availability-only crash (A:H, C/I:N); assumed schema can arrive over the network via the consuming app (AV:N), with no auth or interaction assumed, though real exposure is application-dependent.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch available
Sep 29, 2026 - 13:17 EUVD
Metadata Corrected
Sep 29, 2026 - 12:40 vuln.today
tag: Java added
Analysis Generated
Sep 29, 2026 - 12:06 vuln.today

DescriptionCVE.org

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.

Articles & Coverage 1

News 14 New Java Vulnerabilities - 4 Critical, 10 High Severity Sep 30, 2026

AnalysisAI

Stack exhaustion in the Apache XmlSchema walker (xmlschema-walker) allows a malicious XML Schema to crash any application that parses untrusted XSD/WSDL content, because the walker performs no cycle detection across type derivations, substitution groups, model groups, or attribute groups and recurses until the stack overflows. The flaw is remotely triggerable without authentication (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) and is limited to availability impact - no data disclosure or code execution. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires that the consuming application feed an attacker-controlled XML schema to the Apache XmlSchema walker (xmlschema-walker) component, and that the schema contain a cycle in type derivation, substitution groups, model groups, or attribute groups. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a denial-of-service vulnerability (uncontrolled recursion / stack overflow, CWE-674) in the Apache XmlSchema walker library, reported by the Apache Software Foundation itself. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade Apache XmlSchema to version 2.3.3 or later, the vendor-released patch for this issue, and redeploy all dependent applications (see the advisory at https://lists.apache.org/thread/1cj02tobjyhjqq723bvg78yxkqt1lk7k). … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-88739 vulnerability details – vuln.today
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