{"id":"CVE-2026-102497","title":"The Apache XmlSchema walker (xmlschema-walker) doesn't detect cycles in type derivation, substitution groups, model groups or attribute groups","summary":"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, c…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-674"],"vendor":"apache","product":"xmlschema","affected":["xmlschema < 2.3.3"],"patched":["xmlschema 2.3.3"],"published":"2026-09-29","updated":"2026-10-06","sourceUpdated":"2026-10-06T14:37:44.453","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-102497","references":[{"url":"https://lists.apache.org/thread/1cj02tobjyhjqq723bvg78yxkqt1lk7k","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/29/17","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","cve.org"],"epss":0.00528,"epssPercentile":0.44481,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-29T20:13:25.311609Z"},"ingestedAt":"2026-09-29T12:33:37.292Z","slug":"CVE-2026-102497","body":"## Overview\n\nThe 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.\n\nUsers are recommended to upgrade to version 2.3.3, which fixes this issue.\n\n## Affected\n\n- `xmlschema < 2.3.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `xmlschema 2.3.3`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":213140,"id":"CVE-2026-102497","ts":1790714930991,"field":"cvss","old":null,"new":"7.5"},{"seq":213139,"id":"CVE-2026-102497","ts":1790714930991,"field":"severity","old":"none","new":"high"}]}