By default, StaxUtils placed no limit on the total number of elements or the total number of characters in an XML document.
CVE-2026-108039 · published 9 Oct 2026
How serious is it
- Severity: high, CVSS score 7.5 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-108039?
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Who is affected
- apache cxf: < 4.2.4
- Apache Software Foundation Apache CXF: 4.2.0 to < 4.2.4, 4.0.0 to < 4.1.9, < 3.6.13
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
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References
- lists.apache.org/thread.html/ms2gbpof609o0v1bjlzb1rn7fwh61l1j
- www.openwall.com/lists/oss-security/2026/10/09/14
Merged from NVD. Last updated 24 Oct 2026. All vulnerabilities · RSS · JSON