Apache CXF up to 3.6.11/4.1.7/4.2.2 Form Parameter resource consumption

Summaryinfo

A vulnerability categorized as problematic has been discovered in Apache CXF up to 3.6.11/4.1.7/4.2.2. This affects an unknown function of the component Form Parameter Handler. Executing a manipulation can lead to resource consumption. This vulnerability appears as CVE-2026-57819. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Apache CXF up to 3.6.11/4.1.7/4.2.2. It has been declared as problematic. This vulnerability affects an unknown functionality of the component Form Parameter Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product 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. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at lists.apache.org. This vulnerability was named CVE-2026-57819 since 06/25/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/06/2026). The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 3.6.12, 4.1.8 or 4.2.3 eliminates this vulnerability.

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Productinfo

Type

• Application Server Software

Vendor

• Apache

Name

• CXF

Version

• 3.6.0
• 3.6.1
• 3.6.2
• 3.6.3
• 3.6.4
• 3.6.5
• 3.6.6
• 3.6.7
• 3.6.8
• 3.6.9
• 3.6.10
• 3.6.11
• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 4.1.4
• 4.1.5
• 4.1.6
• 4.1.7
• 4.2.0
• 4.2.1
• 4.2.2

License

• open-source

Website

• Vendor: https://www.apache.org/

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