CVE-2026-64958

Analyzed Analyzed - Analysis Complete

Denial of Service in Apache CXF via Malicious Attachments

Publication date: 2026-08-06

Last updated on: 2026-10-24

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.

CVSS Scores

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Meta Information

Published

2026-08-06

Last Modified

2026-10-24

Generated

2026-11-08

AI Q&A

2026-08-06

EPSS Evaluated

2026-11-07

NVD

CVE-2026-64958

EUVD

EUVD-2026-53853

Affected Vendors & Products

Vendor	Product	Version / Range
apache	cxf	to 3.6.12 (exc)
apache	cxf	From 4.0.0 (inc) to 4.1.8 (exc)
apache	cxf	From 4.2.0 (inc) to 4.2.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

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

Attack-Flow Graph

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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