CVE-2026-54225 Apache Software Foundation CVE debrief

Who should care

Users of Apache CXF, especially those who have not explicitly set an attachment size limit, and security teams responsible for vulnerability management, should be aware of this vulnerability and take action to update to a secure version. Operators and administrators of affected platforms must review and adjust configurations to prevent potential denial of service attacks. Security teams should prioritize updating to a fixed version and review compensating controls for exposed systems.

Technical summary

Apache CXF allows control over the maximum attachment size via the 'attachment-max-size' property. Prior to Apache CXF 4.2.3, 4.1.8, and 3.6.12, no default limit was set, making it possible for attackers to perform denial of service attacks if users didn't explicitly set a limit. The update introduces a default attachment size limit of 50mb. Users should update to Apache CXF version 4.2.3, 4.1.8, or 3.6.12 which fixes this problem by imposing a default attachment size limit of 50mb. This change prevents potential denial of service attacks by limiting the size of attachments that can be processed by Apache CXF. Review and adjust the attachment-max-size limit according to specific requirements to ensure that it aligns with your organization's security policies and operational needs.

Defensive priority

CVE-2026-54225 is rated HIGH with a CVSS score of 7.5, indicating a significant denial of service vulnerability in Apache CXF. Users should prioritize updating to a fixed version.

Recommended defensive actions

• Update to Apache CXF version 4.2.3, 4.1.8, or 3.6.12
• Review and adjust the attachment-max-size limit according to specific requirements
• Monitor Apache CXF installations for compliance with the updated version
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE-2026-54225 issue arises from Apache CXF not imposing a default limit on attachment size, allowing for potential denial of service attacks. A default limit of 50mb is introduced in Apache CXF versions 4.2.3, 4.1.8, and 3.6.12. Evidence is limited to CVE and NVD details. Defenders should verify affected deployments, review official advisories, and update to fixed versions. Additional verification tasks include reviewing compensating controls and monitoring for compliance.

Official resources