Mcp Java Sdk CVEs and Security Vulnerabilities

CVE-2026-34237

MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)

MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 0.83.0, 1.0.1, and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 0.83.0, 1.0.1, and 1.1.1.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed

Vendors

Lfprojects Modelcontextprotocol

Products

Mcp Java Sdk Java-sdk

CVE-2026-35568

MCP Java-SDK has a DNS Rebinding Vulnerability

MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to 1.0.0, the java-sdk contains a DNS rebinding vulnerability. This vulnerability allows an attacker to access a locally or network-private java-sdk MCP server via a victims browser that is either local, or network adjacent. This allows an attacker to make any tool call to the server as if they were a locally running MCP connected AI agent. This vulnerability is fixed in 1.0.0.

CVSS 4.0 · 7.6 High EPSS < 1% KEV · Not listed