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CVE-2026-108395— Model Context Protocol Java SDK HTTP server transports allow memory exhaustion through unbounded request bodies

Quick assessment

Affected
modelcontextprotocol io.modelcontextprotocol.sdk:mcp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Model Context Protocol Java SDK 是 Model Context Protocol 服务器和客户端的官方 Java SDK。在以下版本范围内，Servlet 基于 SSE、Streamable HTTP 以及无状态服务器传输机制会将 HTTP 请求体读入内存，而未施加最大大小限制： 工件中，版本从 0.8.0 至 0.12.0； 工件中，版本从 0.13.0 至 0.18.3，以及从 1.0.0 至 1.1.3； 2.0.0-M1 至 2.0.0 版本。 能够访问受影响传输端点的未认证

CVSS 7.5 · High EPSS 0.61% · P48

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 4

VendorProduct Version RangeStatus
modelcontextprotocol io.modelcontextprotocol.sdk:mcp >= 0.8.0, < 0.13.0 affected
modelcontextprotocol io.modelcontextprotocol.sdk:mcp-core >= 0.13.0, < 0.18.4 affected
>= 1.0.0, < 1.1.4 affected
>= 2.0.0-M1, < 2.0.1 affected
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I. Basic Information for CVE-2026-108395

Vulnerability Information
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Vulnerability Title
Model Context Protocol Java SDK HTTP server transports allow memory exhaustion through unbounded request bodies
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
modelcontextprotocol io.modelcontextprotocol.sdk:mcp >= 0.8.0, < 0.13.0 -
modelcontextprotocol io.modelcontextprotocol.sdk:mcp-core >= 0.13.0, < 0.18.4 -

II. Public POCs for CVE-2026-108395

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III. Intelligence Information for CVE-2026-108395

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Other References for CVE-2026-108395 (4)

Same Patch Batch · modelcontextprotocol · 2026-10-14 · 3 CVEs total

CVE-2026-109527 7.5 HIGH Model Context Protocol Python SDK HTTP and OAuth endpoints allow memory exhaustion through
CVE-2026-59951 6.9 MEDIUM MCP Python SDK: Unbounded Session Accumulation in StreamableHTTP Transport Enables Resourc

IV. Related Vulnerabilities

Same vendor: modelcontextprotocol
Same weakness: CWE-770

V. Comments for CVE-2026-108395

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