IBM ContextForge MCP Gateway is affected by server-side request forgery via DNS TOCTOU at tool invocation
Summary
| CVE | CVE-2026-18905 |
|---|---|
| State | PUBLISHED |
| Assigner | ibm |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-04 16:17:21 UTC |
| Updated | 2026-09-08 14:17:08 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.7 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
EPSS: 0.003070000 probability, percentile 0.230860000 (date 2026-09-07)
Problem Types: CWE-918 | CWE-918 CWE-918 Server-Side Request Forgery (SSRF)
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 7.7 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
| 3.1 | CNA | CVSS | 7.7 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | IBM | ContextForge MCP Gateway Mcp-contextforge-gateway | affected <= v1.0.6 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.ibm.com/support/pages/node/7286053 | [email protected] | www.ibm.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Additional Advisory Data
Solutions
CNA: IBM strongly recommends addressing the vulnerability now. Product(s)Version(s) number and/or range Remediation/Fix/InstructionsIBM ContextForge MCP Gateway<=v1.0.6 https://github.com/IBM/mcp-context-forge/pull/5925_
Workarounds
CNA: Workarounds/Mitigation guidance: No complete workaround exists without upgrading. As a partial mitigation, restrict tool-creation permissions (`tools.create`) to fully trusted users only, limiting the pool of accounts that could stage a registration with a controlled hostname. This does not eliminate the vulnerability but reduces exposure in environments where least-privilege access controls are enforced. IBM strongly recommends upgrading to v1.0.7 or higher.