Vulnerability Details CVE-2026-34237
MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 1.0.1 and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 1.0.1 and 1.1.1.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 7.4%
CVSS Severity
CVSS v3 Score 6.1
References
- https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletSseServerTransportProvider.java#L289
- https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletStreamableServerTransportProvider.java#L525
- https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-hv2w-8mjj-jw22
Products affected by CVE-2026-34237
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cpe:2.3:a:lfprojects:mcp_java_sdk:*
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cpe:2.3:a:lfprojects:mcp_java_sdk:1.1.0