CVE-2026-18905
Received Received - Intake

DNS Rebinding in IBM ContextForge MCP Gateway

Publication date: 2026-09-04

Last updated on: 2026-09-04

Assigner: IBM Corporation

Description
IBM ContextForge MCP Gateway (`mcp-contextforge-gateway`) <= v1.0.6 MCP Context Forge could allow a remote authenticated attacker to obtain sensitive information due to a DNS rebinding vulnerability during tool invocation.

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Meta Information

Published
2026-09-04
Last Modified
2026-09-04
Generated
2026-09-04
AI Q&A
2026-09-04
EPSS Evaluated
N/A
NVD
CVE-2026-18905
EUVD
EUVD-2026-71315

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
ibm mcp_contextforge_gateway to 1.0.6 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

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Executive Summary

IBM ContextForge MCP Gateway versions up to v1.0.6 have a DNS rebinding vulnerability during tool invocation. The gateway validates REST tool target URLs only once at registration and does not re-validate DNS resolution when the tool is used. This allows a remote authenticated attacker to redirect outbound requests to internal network targets by changing DNS records after registration.

Detection Guidance

To detect this vulnerability, monitor DNS resolution changes for registered tool URLs and inspect outbound requests from the IBM ContextForge MCP Gateway. Check for unauthorized internal network access attempts or unexpected external connections. Review logs for tool invocation requests to domains with recent DNS changes.

Impact Analysis

This vulnerability could allow a remote authenticated attacker to access sensitive information by redirecting gateway requests to internal systems. The attacker needs low privileges but can exploit the DNS rebinding to bypass intended access controls.

Mitigation Strategies

Immediately upgrade IBM ContextForge MCP Gateway to version 1.0.7 or higher. Restrict tool creation permissions to trusted users as a temporary measure. Monitor network traffic for suspicious outbound requests and review DNS resolution logs for anomalies.

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