CVE-2026-108395 (GCVE-0-2026-108395)
Vulnerability from cvelistv5 – Published: 2026-10-14 17:46 – Updated: 2026-10-14 19:29
VLAI
EPSS
VEX
Title
Model Context Protocol Java SDK HTTP server transports allow memory exhaustion through unbounded request bodies
Summary
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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-14 19:28 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/modelcontextprotocol/java-sdk/… | x_refsource_CONFIRM |
| https://github.com/modelcontextprotocol/java-sdk/… | x_refsource_MISC |
| https://github.com/modelcontextprotocol/java-sdk/… | x_refsource_MISC |
| https://github.com/modelcontextprotocol/java-sdk/… | x_refsource_MISC |
| https://github.com/modelcontextprotocol/java-sdk/… | x_refsource_MISC |
| https://github.com/modelcontextprotocol/java-sdk/… | x_refsource_MISC |
| https://github.com/modelcontextprotocol/java-sdk/… | x_refsource_MISC |
| https://github.com/modelcontextprotocol/java-sdk/… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| modelcontextprotocol | io.modelcontextprotocol.sdk:mcp |
Affected:
>= 0.8.0, < 0.13.0
|
guessed | |
| modelcontextprotocol | io.modelcontextprotocol.sdk:mcp-core |
Affected:
>= 0.13.0, < 0.18.4
Affected: >= 1.0.0, < 1.1.4 Affected: >= 2.0.0-M1, < 2.0.1 |
guessed |
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