What’s Vulnerable › Vulnerabilities

CVE-2026-35568: MCP Java-SDK has a DNS Rebinding Vulnerability

• Severity: medium (CVSS 5.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-07 · updated 2026-07-24
• Weakness: CWE-346

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.

Affected products

• modelcontextprotocol java-sdk: before 1.0.0 — fixed in 1.0.0

How to fix

Upgrade to a fixed version: modelcontextprotocol java-sdk 1.0.0. Check the vendor advisory for mitigations.

References

• https://github.com/modelcontextprotocol/java-sdk/releases/tag/v1.0.0
• https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-8jxr-pr72-r468

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