CVE-2026-94407

Description

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.

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

• 6.5CVSS 3.1, Mediumfrom the CNA (ibm)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

What to do

• IBM strongly recommends addressing the vulnerability now. Product(s)Version(s) number and/or range Remediation/Fix/InstructionsIBM ContextForge MCP Gateway v1.0.0 - v1.0.11Upgrade to v1.1.0. See [ v1.1.0 release notes https://github.com/IBM/mcp-context-forge/releases/tag/v1.1.0 ]CNA solution statement
• None. IBM strongly recommends upgrading to the fixed version.CNA workaround statement

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Timeline

1. 13 Nov 2026 Published

Weakness

• CWE-1333

References

• www.ibm.comvendor-advisorypatch