CVE-2026-50645: Apache CXF: No restriction on attachment headers per message

[Colm O hEigeartaigh <coheigea () apache org>]

Severity: low 

Affected versions:

- Apache CXF (org.apache.cxf:cxf-core) 4.2.0 before 4.2.2
- Apache CXF (org.apache.cxf:cxf-core) before 4.1.7

Description:

There is no restriction on the amount of attachment headers that a message can contain when being deserialized by 
Apache CXF, which can lead to uncontrolled resource consumption or a denial of service attack. Users are recommended to 
upgrade to versions 4.2.2 or 4.1.7, which fix this issue by imposing a maximum default of 500 attachments per message.

References:

https://cxf.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-50645