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.
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mcp_java_sdk
Vendor: lfprojects
Actively Exploited
0
CISA KEV List
PoC / Exploits
0
Code Available
Total RCEs
1
Remote Access
Total CVEs
5
Total Indexed
Avg. EPSS
0.18%
Exploit Prob.
Security Vulnerability Index
Page 1 / 1
7.6
CVSS
Severity: HIGH
6.1
CVSS
CVE-2026-34237
RCE
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.
Severity: MEDIUM