CVE-2026-102497
A malicious schema with such a cycle can make the walker recurse until the stack overflows, causing a denial of service.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.53%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.53% probability · 44th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-674
- Affected
- apache/xmlschema
- Source
- security@apache.org
EPSS moved from 0.4% on 30 September 2026 to 0.5% on 26 October 2026.
References
- https://lists.apache.org/thread/1cj02tobjyhjqq723bvg78yxkqt1lk7kMailing List, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/09/29/17Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.