GHSA-8jxr-pr72-r468

Source

https://github.com/advisories/GHSA-8jxr-pr72-r468

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-8jxr-pr72-r468/GHSA-8jxr-pr72-r468.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-8jxr-pr72-r468

Aliases

CVE-2026-35568

Published

2026-04-07T20:13:32Z

Modified

2026-04-08T12:07:57.138777Z

Severity

7.6 (High) CVSS_V4 - 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 CVSS Calculator

Summary

Java-SDK has a DNS Rebinding Vulnerability

Details

Summary

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.

Details

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: - Spring AI

Impact

Any developer connecting to a malicious website can inadvertently allow an attacker to make tool calls to local or private-network MCP servers.

Workarounds

Users can mitigate this risk by: 1. Running the MCP server behind a reverse proxy (like Nginx or HAProxy) configured to strictly validate the Host and Origin headers. 2. Using a framework that inherently enforces strict CORS and Origin validation (such as Spring AI).

Database specific

{
    "cwe_ids": [
        "CWE-346"
    ],
    "github_reviewed": true,
    "severity": "HIGH",
    "github_reviewed_at": "2026-04-07T20:13:32Z",
    "nvd_published_at": "2026-04-07T22:16:23Z"
}

References

Affected packages

Maven / io.modelcontextprotocol.sdk:mcp-core

Package

Name: io.modelcontextprotocol.sdk:mcp-core; View open source insights on deps.dev
Purl: pkg:maven/io.modelcontextprotocol.sdk/mcp-core

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.0.0

Affected versions

0.*

0.13.0

0.13.1

0.14.0

0.14.1

0.15.0

0.16.0

0.17.0

0.17.1

0.17.2

0.18.0

0.18.1

1.*

1.0.0-RC3

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-8jxr-pr72-r468/GHSA-8jxr-pr72-r468.json"