Thursday, 29 October 2026
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DNS rebinding flaw in MCP Java SDK allows remote tool calls (CVE-2026-35568)

Versions of the official Model Context Protocol Java SDK prior to 1.0.0 contain a DNS rebinding vulnerability that lets an attacker reach a local or network-private MCP server through a victim's browser and invoke any tool call as if they were a locally connected AI agent. The issue is fixed in version 1.0.0.

Disclosed 7 April 2026 · Record updated 1 October 2026

Impact

An attacker able to lure a local or network-adjacent victim's browser could make arbitrary tool calls against otherwise private MCP servers built on the Java SDK.

Our coverage

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-35568