CVE-2025-64443Network attack vector

Tool manipulation via missing Origin validation

Published Dec 3, 2025 · Updated Dec 3, 2025

DNS rebinding in Docker MCP Gateway 0.27.0 and earlier allows remote attackers to manipulate proxied MCP tools through a victim's browser. The SSE and streamable HTTP handlers accept browser requests without validating the Origin header, exposing locally reachable MCP endpoints to rebound domains. Exploitation requires a victim to visit attacker-controlled content while the gateway uses nondefault SSE or streaming transport; default stdio mode is unaffected.

CVSS severity7.3
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DNS rebinding in Docker MCP Gateway 0.27.0 and earlier allows remote attackers to manipulate proxied MCP tools through a victim's browser. The SSE and streamable HTTP handlers accept browser requests without validating the Origin header, exposing locally reachable MCP endpoints to rebound domains. Exploitation requires a victim to visit attacker-controlled content while the gateway uses nondefault SSE or streaming transport; default stdio mode is unaffected.

The record

CVE
CVE-2025-64443
Published
Dec 3, 2025
Updated
Dec 3, 2025
Vendor
Docker
Product
Docker MCP Gateway
Classifications
CWE-749, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.28.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Docker · Docker MCP Gatewayversion=< 0.28.0

Published CVSS scores

7.3GitHub, Inc.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
9.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-749Exposed Dangerous Method or Function
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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