CVE-2026-64958
Received Received - Intake

Denial of Service in Apache CXF via Malicious Attachments

Publication date: 2026-08-06

Last updated on: 2026-08-06

Assigner: Apache Software Foundation

Description
An incomplete fix for CVE-2026-50645 means that it is still possible to perform a denial of service attack on Apache CXF by sending a message with many attachment headers. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.

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Meta Information

Published
2026-08-06
Last Modified
2026-08-06
Generated
2026-08-06
AI Q&A
2026-08-06
EPSS Evaluated
N/A
NVD
CVE-2026-64958
EUVD
EUVD-2026-53853

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
apache cxf 4.2.3
apache cxf 4.1.8
apache cxf 3.6.12

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

This vulnerability is a denial of service attack affecting Apache CXF. It occurs when an attacker sends a message with numerous attachment headers, exploiting an incomplete fix for a previous issue (CVE-2026-50645). The flaw allows the system to be overwhelmed, disrupting normal operations.

Detection Guidance

To detect this vulnerability, check Apache CXF versions for affected releases (older than 4.2.3, 4.1.8, or 3.6.12). Use commands like 'cxf --version' or inspect server logs for unusual attachment header patterns causing high resource usage.

Impact Analysis

If you use Apache CXF, this vulnerability could allow attackers to crash your services by sending specially crafted messages. This may lead to service unavailability, downtime, or degraded performance for your applications relying on Apache CXF.

Compliance Impact

This vulnerability could potentially impact compliance with standards like GDPR and HIPAA by enabling denial of service attacks, which may disrupt services handling sensitive personal or health data. Unpatched systems could fail to meet availability requirements under these regulations.

Mitigation Strategies

Upgrade Apache CXF to versions 4.2.3, 4.1.8, or 3.6.12 to address the incomplete fix for CVE-2026-50645 and prevent denial of service via excessive attachment headers.

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