ScriptKittyOS beam_mcp up to 0.10.0 Schema Validation BeamMCP.Schema.validate input validation

Summaryinfo

A vulnerability categorized as critical has been discovered in ScriptKittyOS beam_mcp up to 0.10.0. This impacts the function BeamMCP.Schema.validate of the component Schema Validation. Executing a manipulation can lead to input validation. This vulnerability is tracked as CVE-2026-88257. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in ScriptKittyOS beam_mcp up to 0.10.0. It has been declared as critical. This vulnerability affects the function BeamMCP.Schema.validate of the component Schema Validation. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Improper Input Validation vulnerability in BeamMCP.Schema in ScriptKittyOS beam_mcp allows an MCP client to reach a tool's dispatch function with arguments that violate the input schema the server advertised. BeamMCP.Schema.validate/2 checked type, required, additionalProperties, enum and numeric bounds on the top-level arguments object only. Constraints inside nested objects and on array items (items, minItems, maxItems, minLength, maxLength, pattern, nested required, enum and additionalProperties: false) were advertised by tools/list and never checked at tools/call or prompts/get, and keywords outside the enforced subset (oneOf, anyOf, $ref) were advertised and ignored. A host whose dispatch code relies on the schema it declared receives values the schema forbids, such as an out-of-range number or an undeclared key inside a nested object. What the host does with such a value decides the impact. This issue affects beam_mcp: from 0.1.0 before 0.10.1.

The advisory is available at github.com. This vulnerability was named CVE-2026-88257 since 10/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit.

Upgrading to version 0.10.1 eliminates this vulnerability.

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Productinfo

Vendor

• ScriptKittyOS

Name

• beam_mcp

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10.0

Website

• Product: https://github.com/ScriptKittyOS/beam_mcp/

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