CVE-2026-108395
Received
Received - Intake
Memory Exhaustion in Model Context Protocol Java SDK
Vulnerability report for CVE-2026-108395, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-14
Last updated on: 2026-10-14
Assigner: GitHub, Inc.
Description
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| modelcontextprotocol | io.modelcontextprotocol.sdk:mcp | >= 0.8.0, < 0.13.0 |
| modelcontextprotocol | io.modelcontextprotocol.sdk:mcp-core | >= 0.13.0, < 0.18.4 |
| modelcontextprotocol | io.modelcontextprotocol.sdk:mcp-core | >= 1.0.0, < 1.1.4 |
| modelcontextprotocol | io.modelcontextprotocol.sdk:mcp-core | >= 2.0.0-M1, < 2.0.1 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-770 | The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. |
