By default, StaxUtils placed no limit on the total number of elements or the total number of characters in an XML document. A very large request could therefore use a lot of memory and CPU during parsing, especially where CXF builds a DOM from the input (for example SAAJ or WS-Security), and could cause a denial of service when no request size limit was configured. Both limits now have defaults: the maximum element count is 100 × maxChildElements (5,000,000 by default), and the maximum document size is 256M characters. Applications that process larger documents can raise the limits with the org.apache.cxf.stax.maxElementCount and org.apache.cxf.stax.maxXMLCharacters properties.
Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.
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History

Fri, 09 Oct 2026 11:45:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache cxf
Weaknesses CWE-674
Vendors & Products Apache
Apache cxf

Fri, 09 Oct 2026 10:30:00 +0000

Type Values Removed Values Added
Description By default, StaxUtils placed no limit on the total number of elements or the total number of characters in an XML document. A very large request could therefore use a lot of memory and CPU during parsing, especially where CXF builds a DOM from the input (for example SAAJ or WS-Security), and could cause a denial of service when no request size limit was configured. Both limits now have defaults: the maximum element count is 100 × maxChildElements (5,000,000 by default), and the maximum document size is 256M characters. Applications that process larger documents can raise the limits with the org.apache.cxf.stax.maxElementCount and org.apache.cxf.stax.maxXMLCharacters properties. Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.
Title Apache CXF: Prevent unbounded XML document size in StaxUtils by adding default element and character limits
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cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-10-09T11:07:55.068Z

Reserved: 2026-10-09T09:27:04.033Z

Link: CVE-2026-108039

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-09T11:17:02.387

Modified: 2026-10-09T11:17:02.387

Link: CVE-2026-108039

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-09T11:30:06Z

Weaknesses