CVE-2026-54225 in CXF
Summary
by MITRE • 08/06/2026
Apache CXF allows to control the maximum attachment size via the "attachment-max-size". Prior to Apache CXF 4.2.3 and 4.1.8 and 3.6.12, there was no default placed on this size, meaning that a denial of service attack is possible if the user doesn't explicitly set the limit. Users should update to Apache CXF 4.2.3 or 4.1.8 or 3.6.12 which fixes this problem by imposing a default attachment size limit of 50mb.
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Analysis
by VulDB Data Team • 08/06/2026
This vulnerability represents a critical denial of service weakness in Apache CXF web services framework that affects multiple versions including 4.2.3, 4.1.8, and 3.6.12. The flaw stems from the absence of a default maximum attachment size limit, creating an exploitable condition where malicious actors can overwhelm system resources through excessive data transfers. This issue aligns with CWE-400 which categorizes improper resource management as a fundamental security weakness, particularly in service-oriented architectures where attachment handling is common.
The technical implementation flaw occurs within the attachment processing mechanism of Apache CXF's message handling pipeline. When no explicit "attachment-max-size" parameter is configured by administrators, the framework fails to enforce any upper bounds on incoming binary attachments, allowing unlimited data consumption. This creates a direct path for resource exhaustion attacks where attackers can submit large attachments that consume memory, disk space, or network bandwidth until system resources are depleted.
The operational impact of this vulnerability extends beyond simple service disruption to encompass potential system compromise and business continuity risks. Attackers leveraging this weakness can perform denial of service attacks by uploading arbitrarily large files, potentially causing memory exhaustion, disk full conditions, or network saturation that affects legitimate users. The vulnerability particularly impacts enterprise environments where CXF services handle file uploads, document processing, or binary data exchanges, making it a significant concern for organizations relying on these web services frameworks.
Organizations should immediately implement the recommended patches for Apache CXF versions 4.2.3, 4.1.8, and 3.6.12 which introduce a default attachment size limit of 50 megabytes. This mitigation addresses the root cause by establishing a reasonable upper bound on attachment sizes while maintaining operational functionality. Security teams should also conduct comprehensive audits of existing CXF configurations to ensure that explicit attachment size limits are properly configured across all environments, particularly in production systems where sensitive data processing occurs.
The vulnerability demonstrates characteristics consistent with attack patterns documented in MITRE ATT&CK framework under the resource exhaustion category, specifically targeting system resources through excessive data consumption. Organizations should consider implementing additional monitoring and alerting mechanisms around attachment handling to detect anomalous usage patterns that might indicate exploitation attempts, while also maintaining regular patch management procedures to address similar vulnerabilities proactively.
This issue highlights the importance of secure configuration defaults in enterprise software frameworks, where missing security controls at the framework level can create significant operational risks. The fix implemented by Apache CXF developers represents a defensive programming approach that prevents resource exhaustion through proper boundary enforcement, aligning with security best practices for service-oriented architectures and web service implementations.