CVE-2026-35568— MCP Java-SDK has a DNS Rebinding Vulnerability
Quick assessment
Affected
modelcontextprotocol java-sdk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
MCP Java SDK是Model Context Protocol开源的一个用于Java应用集成AI模型与工具的标准协议SDK。 MCP Java SDK 1.0.0之前版本存在访问控制错误漏洞，该漏洞源于DNS重绑定漏洞，可能导致攻击者通过受害者的浏览器访问本地或网络私有的MCP服务器，从而执行任意工具调用。
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I. Basic Information for CVE-2026-35568
Vulnerability Information
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Vulnerability Title
MCP Java-SDK has a DNS Rebinding Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
MCP Java SDK 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MCP Java SDK是Model Context Protocol开源的一个用于Java应用集成AI模型与工具的标准协议SDK。 MCP Java SDK 1.0.0之前版本存在访问控制错误漏洞，该漏洞源于DNS重绑定漏洞，可能导致攻击者通过受害者的浏览器访问本地或网络私有的MCP服务器，从而执行任意工具调用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| modelcontextprotocol | java-sdk | < 1.0.0 | - |
|
II. Public POCs for CVE-2026-35568
| # | POC Description | Source Link | Shenlong Link |
|---|
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V. Comments for CVE-2026-35568
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