Apache CXF Form Param Limit Leak Enables DoS (before 4.2.3/4.1.8/3.6.12)
CVE-2026-57819 Published on August 6, 2026
Apache CXF: No default restriction on the amount of form parameters per message
Apache CXF allows to set a limit on the number of form parameters in a JAX-RS message via the "maxFormParameterCount" configuration option. However, no default limit is set which may lead to denial of service attacks when processing requests with very large numbers of form parameters. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue by using a default limit of 500 parameters.
Weakness Type
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2026-57819 has been classified to as a Resource Exhaustion vulnerability or weakness.
Products Associated with CVE-2026-57819
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Affected Versions
Apache Software Foundation Apache CXF:- Version 4.2.0 and below 4.2.3 is affected.
- Version 4.0.0 and below 4.1.8 is affected.
- Before 3.6.12 is affected.