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.
Casky was already ahead
This CVE exploits attack patterns that Casky's 0matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.
CVE-2026-102497 is a denial-of-service vulnerability in Apache XmlSchema's walker component that fails to detect cycles within XML schema type derivations, substitution groups, model groups, and attribute groups. When a malicious actor crafts a schema containing circular references, the walker enters infinite recursion, exhausting the call stack and crashing the application. This vulnerability affects any system processing untrusted XML schemas, including web services, API gateways, XML processors, and enterprise integration platforms that validate or parse schema documents. With a CVSS score of 7.5, this represents a significant availability risk for organizations relying on XmlSchema for schema validation and processing.
While CVE-2026-102497 currently maps to zero Casky skills due to its recent discovery and lack of defined MITRE ATT&CK techniques, practitioners can leverage Casky's Claude-powered reasoning engine to identify attack surface patterns. Security teams should monitor for Resource Exhaustion indicators (T1561 when available) and watch for anomalous application behavior such as sudden CPU spikes, memory exhaustion, or unexpected service crashes following schema validation attempts. By analyzing telemetry from XML processing pipelines and schema validation logs through Casky's extended reasoning capabilities, practitioners can detect maliciously crafted schemas before they trigger stack overflow conditions. As threat intelligence evolves and MITRE mappings update, Casky will automatically surface relevant skills to help teams correlate this vulnerability with broader denial-of-service attack patterns and defensive postures.
Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →
Casky has 0 skills that investigate the attack patterns behind CVE-2026-102497. Run one and get CVSS-scored findings in 3 minutes.
Run the skill that detects this →© 2026 Casky.AI, Inc. · AI Security Investigation