CVE-2025-64443: DNS Rebinding vulnerability present when running MCP Gateway in sse or streaming mode
Impact When ran in sse or streaming mode (--transport), the Docker MCP Gateway is vulnerable to a DNS rebinding attack.
Vulnerability allows for Browser-Based exploitation of any MCP servers that are executing within the Docker MCP Gateway. Any tools or other features exposed by MCP servers can be manipulated by an attacker who is able to get a victim to visit a malicious website, or if a victim is served a malicious advertisement.
The MCP Gateway is not prone to this attack when started in its default stdio mode, which does not listen on any network ports.
Patches Patch available in version v0.28.0
Workarounds Do not start the MCP gateway in sse or streaming mode (use default stdio)
Other sources
MCP Gateway allows easy and secure running and deployment of MCP servers. In versions 0.27.0 and earlier, when MCP Gateway runs in sse or streaming transport mode, it is vulnerable to DNS rebinding. An attacker who can get a victim to visit a malicious website or be served a malicious advertisement can perform browser-based exploitation of MCP servers executing behind the gateway, including manipulating tools or other features exposed by those MCP servers. MCP Gateway is not affected when running in the default stdio mode, which does not listen on network ports. Version 0.28.0 fixes this issue.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2025-64443?
CVE-2025-64443 has a high severity rating due to its potential for browser-based exploitation in the Docker MCP Gateway.
How do I fix CVE-2025-64443?
To mitigate CVE-2025-64443, update the Docker MCP Gateway to version 0.28.0 or later.
Which versions of Docker MCP Gateway are affected by CVE-2025-64443?
CVE-2025-64443 affects all versions of the Docker MCP Gateway up to and including version 0.27.0.
What type of attack does CVE-2025-64443 involve?
CVE-2025-64443 involves a DNS rebinding attack that can allow unauthorized access to MCP servers.
What components are impacted by CVE-2025-64443?
CVE-2025-64443 affects the Docker MCP Gateway when it is running in SSE or streaming mode.