CVE-2026-35568 HIGH

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

Vendor Modelcontextprotocol

Product java-sdk

Weakness CWE-346 · Origin validation

Published April 7, 2026

Last update April 8, 2026

View on NVD All CVEs

CVSS base score

7.6/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction —

Confidentiality —

Integrity —

CVSS vector

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

What the vulnerability does

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.

Key dates

Disclosure timeline

April 7, 2026 CVE published

April 8, 2026 Record updated