# CVE-2026-94407: IBM ContextForge MCP Gateway is affected by a regular expression denial of service

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

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.

## Remediation

- fix: 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 ] (source: CNA: ibm)
- workaround: None. IBM strongly recommends upgrading to the fixed version. (source: CNA: ibm)
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: ibm) — https://www.ibm.com/support/pages/node/7296667

## Affected products and versions

- IBM / ContextForge MCP Gateway: ≥ 1.0.0; ≤ 1.0.11 (affected, semver). Source: CNA: ibm

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: CNA: ibm

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: NVD: psirt@us.ibm.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-1333

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.ibm.com/support/pages/node/7296667 (CNA: ibm; vendor-advisory, patch)

- https://www.ibm.com/support/pages/node/7296667 (psirt@us.ibm.com)

## Provenance

- CNA: ibm: https://www.cve.org/CVERecord?id=CVE-2026-94407; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-94407; retrieved 2026-11-14; source updated 2026-11-13

Revision: 71dae8403a016d3a1fbe28ef5e68e25f056fd1d6bd08effce432a4a77df82756

Canonical: https://y2.dev/cve/CVE-2026-94407

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