Model Context Protocol Java SDK HTTP server transports allow memory exhaustion through unbounded request bodies

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-108395
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-14 18:17:27 UTC
Updated2026-10-14 20:17:30 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-770 | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Modelcontextprotocol Io.modelcontextprotocol.sdkmcp affected >= 0.8.0, < 0.13.0 Not specified
CNA Modelcontextprotocol Io.modelcontextprotocol.sdkmcp-core affected >= 0.13.0, < 0.18.4 Not specified
CNA Modelcontextprotocol Io.modelcontextprotocol.sdkmcp-core affected >= 1.0.0, < 1.1.4 Not specified
CNA Modelcontextprotocol Io.modelcontextprotocol.sdkmcp-core affected >= 2.0.0-M1, < 2.0.1 Not specified

References

ReferenceSourceLinkTags
github.com/modelcontextprotocol/java-sdk/commit/8c0fdd1b1f76adba3ce7945d... [email protected] github.com
github.com/modelcontextprotocol/java-sdk/commit/9e4d5fa827b6ba69457f5fd9... [email protected] github.com
github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-4x8c-5... [email protected] github.com
github.com/modelcontextprotocol/java-sdk/releases/tag/v0.18.4 [email protected] github.com
github.com/modelcontextprotocol/java-sdk/commit/6a41dedaa0625551582d8247... [email protected] github.com
github.com/modelcontextprotocol/java-sdk/releases/tag/v1.1.4 [email protected] github.com
github.com/modelcontextprotocol/java-sdk/releases/tag/v2.0.1 [email protected] github.com
github.com/modelcontextprotocol/java-sdk/commit/1499df22c7023aa257223143... [email protected] github.com
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