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