CVE-2026-102497Apache XMLSchema: Denial of service through cyclic schema definitions in the schema walker
Updated under an hour ago ()
Does this affect you?
It affects Apache Software Foundation Apache XMLSchema and 1 other product. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.53%, higher than 43% of scored CVEs.
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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.
- CVSS
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-674
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.53% (percentile 43)
- Assigned by
- apache
- NVD analysis
- Analyzed
- Record last updated
- Sep 29, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Apache Software Foundation Apache XMLSchema apache_software_foundation:apache_xmlschema (from the name) | before 2.3.3 | CNA record |
apache xmlschema apache:xmlschema | before 2.3.3 | NVD |
References
- https://lists.apache.org/thread/1cj02tobjyhjqq723bvg78yxkqt1lk7kvendor-advisory, mailing-list
- http://www.openwall.com/lists/oss-security/2026/09/29/17mailing-list, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.