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Security Bulletin: IBM ContextForge MCP Gateway is affected by a denial-of-service via tool name collision through slug normalization

Security Bulletin


Summary

IBM ContextForge MCP Gateway contains a vulnerability in its federated gateway tool-name normalization logic where an authenticated user with gateway-create permission can register a gateway whose computed tool slug collides with an existing public tool name in the same team, causing standard MCP `tools/call` requests for the affected tool to fail with an ambiguity error and rendering that tool unavailable to all team members until an administrator intervenes.

Vulnerability Details

CVEID:   CVE-2026-18484
DESCRIPTION:   MCP Context Forge could allow a remote authenticated attacker to cause a denial of service due to improper slug normalization causing tool name collisions.
CWE:   CWE-706: Use of Incorrectly-Resolved Name or Reference
CVSS Source:   IBM
CVSS Base score:   6.5
CVSS Vector:   (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

 

Affected Product(s)Version(s)
IBM ContextForge MCP Gateway
1.0.0 – 1.0.11

 

Remediation/Fixes

IBM strongly recommends addressing the vulnerability now.

Product(s)Version(s) number and/or range Remediation/Fix/Instructions
IBM ContextForge MCP Gateway
1.0.0 - v1.0.11
Upgrade to v1.1.0. See [v1.1.0 release notes]

 

  

Workarounds and Mitigations

If an immediate upgrade is not possible, an administrator can mitigate an active collision by renaming or removing one of the two conflicting gateway registrations, which restores invocability of the affected tool. There is no configuration setting that prevents the collision from being created prior to the v1.1.0 fix.

IBM strongly recommends upgrading to v1.1.0.

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References

Off
 

 

 

Acknowledgement

Change History

27 Oct 2026: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location

Worldwide

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Document Information

Modified date:
27 October 2026

Initial Publish date:
27 October 2026

UID

ibm17294233