Model Context Protocol Java SDK prior 0.18.4/1.1.4/2.0.1 Servlet allocation of resources

Summaryinfo

A vulnerability labeled as problematic has been found in Model Context Protocol Java SDK. The impacted element is an unknown function of the component Servlet. Executing a manipulation can lead to allocation of resources. This vulnerability is tracked as CVE-2026-108395. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Model Context Protocol Java SDK. It has been declared as problematic. This vulnerability affects an unknown part of the component Servlet. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. CVE summarizes:

The Model Context Protocol Java SDK is the official Java SDK for Model Context Protocol servers and clients. From version 0.8.0 through 0.12.0 in the io.modelcontextprotocol.sdk:mcp artifact, from 0.13.0 through 0.18.3 and 1.0.0 through 1.1.3 in io.modelcontextprotocol.sdk:mcp-core, and from mcp-core 2.0.0-M1 through 2.0.0, the Servlet-based SSE, Streamable HTTP, and Stateless server transports read an HTTP request body into memory without enforcing a maximum size. An unauthenticated remote client able to reach an affected transport can stream an arbitrarily large POST body, including with chunked transfer encoding, until the Java process exhausts its heap and becomes unavailable. Authentication, Origin or Host validation, or an upstream request-size limit can reject the request before the vulnerable read. The maintained mcp-core lines are fixed in versions 0.18.4, 1.1.4, and 2.0.1.

The advisory is available at github.com. This vulnerability was named CVE-2026-108395 since 10/09/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 0.18.4, 1.1.4 or 2.0.1 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• Model Context Protocol

Name

• Java SDK

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