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

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) 4.0.0 before 4.1.7
- Apache CXF (org.apache.cxf:cxf-core) before 3.6.12

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 or 3.6.12, which fix this issue by imposing a maximum default of 500 attachments per message.

References:

https://lists.apache.org/thread/24zb7cqcvykhwm0j797dmdq25s61mj93
https://cxf.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-50645