Advisory severityUnratedApache Software Foundation Updated

Advisory [CVE-2026-108039] By default, StaxUtils placed no limit on the total number of elements or the total number of characters in an XML document

This security Apache Software Foundation advisory covers CVE-2026-108039; related products: Apache CXF.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-108039 Source published Oct 9, 2026Source updated Oct 9, 2026

VulniPulse record published Oct 9, 2026Record updated Oct 9, 2026

CVE-2026-108039

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Summary

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.

Affected versions

Apache CXF 4.2.0 before 4.2.4
Apache CXF 4.0.0 before 4.1.9
Apache CXF before 3.6.13

Official advisory · medium-confidence parse· fetched 16 hours ago·verify at source

Fixed versions

4.2.4
4.1.9
3.6.13

Official advisory · medium-confidence parse· fetched 16 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation

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.
Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.

Official advisory · medium-confidence parse· fetched 16 hours ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Apache Software Foundation
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-108039 instead of the raw feed document.
CVE Program

Cross-references

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CVE-2026-108039NVD CVE.org MITRE

Official resources

ASF Security — reporting & CVE process
Official documentation
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Apache project downloads (fixed releases)
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