EUVD-2026-88739
GHSA-9wgm-rwmh-4mcv
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
Lifecycle Timeline
3DescriptionCVE.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
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
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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Same weakness CWE-674 – Uncontrolled Recursion
View allSame technique Denial Of Service
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External POC / Exploit Code
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