IBM ContextForge MCP Gateway up to 1.0.11 JSON Schema Validation pattern resource consumption

Summaryinfo

A vulnerability has been found in IBM ContextForge MCP Gateway up to 1.0.11 and classified as problematic. Affected by this vulnerability is an unknown functionality of the component JSON Schema Validation. Performing a manipulation of the argument Pattern results in resource consumption. This vulnerability is cataloged as CVE-2026-94407. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in IBM ContextForge MCP Gateway up to 1.0.11. This affects an unknown part of the component JSON Schema Validation. The manipulation of the argument pattern with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource. This is going to have an impact on availability. The summary by CVE is:

IBM ContextForge MCP Gateway 1.0.0 through 1.0.11 is potentially vulnerable to denial of service due to uncontrolled regular expression complexity (CWE-400 / ReDoS). An authenticated user with tool-registration privileges can embed catastrophically backtracking regex patterns in a tool's JSON Schema `pattern` field; when ContextForge validates arguments against that schema, the validation call may consume unbounded CPU, potentially degrading gateway availability.

The advisory is shared at ibm.com. This vulnerability is uniquely identified as CVE-2026-94407 since 09/21/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/13/2026). MITRE ATT&CK project uses the attack technique T1499 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Artificial Intelligence Software

Vendor

• IBM

Name

• ContextForge MCP Gateway

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.0.4
• 1.0.5
• 1.0.6
• 1.0.7
• 1.0.8
• 1.0.9
• 1.0.10
• 1.0.11

License

• commercial

Website

• Vendor: https://www.ibm.com/

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