| Package | Affected versions | Patched versions |
|---|---|---|
| io.modelcontextprotocol.sdk:mcp-core | < 1.0.0 | 1.0.0 |
| mcp java sdk | < 1.0.0 | 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.
Prior to 1.0.0 no Origin header validation was occurring, in violation of the MCP specification. Base Protocol > Transports: 2.0.1 Security Warning:
1: Servers MUST validate the Origin header on all incoming connections to prevent DNS rebinding attacks.
When the web server serving HTTP traffic to the MCP server does not perform standard CORS checks, a DNS rebinding attack is possible.
Some default server configurations and frameworks come with embedded Origin header validation. MCP servers built using those are not vulnerable to this issue. For example, the following are NOT vulnerable:
Any developer connecting to a malicious website can inadvertently allow an attacker to make tool calls to local or private-network MCP servers.
Users can mitigate this risk by:
Host and Origin headers.Running one of these products? Scan your site to see whether it exposes a vulnerable version.
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