What’s Vulnerable › Vulnerabilities

CVE-2025-64443: DNS Rebinding vulnerability present when running MCP Gateway in sse or streaming mode

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-03 · updated 2026-10-18
• Weakness: CWE-749

Description

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.

Affected products

• docker mcp-gateway: before 0.28.0 — fixed in 0.28.0

How to fix

Upgrade to a fixed version: docker mcp-gateway 0.28.0. Check the vendor advisory for mitigations.

References

• https://github.com/docker/mcp-gateway/commit/6b076b2479d8d1345c50c112119c62978d46858e
• https://github.com/docker/mcp-gateway/security/advisories/GHSA-46gc-mwh4-cc5r

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