Bug 2548457 (CVE-2026-108039)

Summary: CVE-2026-108039 org.apache.cxf/cxf-core: Apache CXF: Denial of Service via unrestricted XML parsing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: anujha, aschwart, asoldano, aszczucz, bbaranow, bmaxwell, boliveir, bstansbe, csutherl, dlofthou, drichtar, dsoumis, fmariani, fmongiar, gmalinko, istudens, ivassile, iweiss, janstey, jclere, jnethert, jwon, mcarlett, mosmerov, mposolda, msvehla, nwallace, pberan, pdelbell, pesilva, pjindal, plodge, pmackay, rmartinc, rmaucher, rstancel, rstepani, ssilvert, sthorger, szappis, tcunning, thjenkin, vdosoudi, vmuzikar, yfang
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Apache CXF. By default, the XML parsing utility does not enforce limits on the total number of elements or characters within an incoming XML document. A remote attacker could exploit this vulnerability by sending an excessively large XML request, causing the application to consume excessive memory and CPU resources during processing, leading to a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-10-09 10:31:35 UTC 
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.