Medium 6.6Published Sep 14, 2026

CVE-2026-53708ContextForge: DNS TOCTOU race condition causes SSRF protection bypass (`/admin/gateways/test`)

Updated under an hour ago (2026-10-19 08:00 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

ContextForge is an AI gateway, registry, and proxy that provides centralized discovery, guardrails, and management for MCP, A2A, and REST or gRPC APIs. Prior to 1.0.3, the /admin/gateways/test call site in mcpgateway/admin.py calls validate_gateway_test_url() in mcpgateway/common/validators.py to resolve and reject private, loopback, link-local, and cloud-metadata addresses, but ResilientHttpClient later resolves the original hostname again without binding the validated address. When MCPGATEWAY_ADMIN_API_ENABLED is enabled, an attacker with a database-backed role containing explicit gateways.read permission can use DNS rebinding to return a public address during validation and a private or metadata address during connection, bypassing ssrf_blocked_networks and ssrf_dns_fail_closed because those controls apply only to the validation-time result. The endpoint's allow_admin_bypass=False setting means a bootstrap-only virtual platform-admin identity without a database role is not sufficient. Successful exploitation can reach internal services and cloud metadata, expose cloud credentials, access internal APIs, or probe internal network ports. This issue is fixed in version 1.0.3.

CVSS: 6.6 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N
Weakness (CWE): CWE-350, CWE-367, CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Sep 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

IBM mcp-context-forge ibm:mcp_context_forge (from the name)	before 1.0.3	CNA record
IBM mcp-contextforge-gateway ibm:mcp_contextforge_gateway (from the name)	before 1.0.3	CNA record

References

https://github.com/IBM/mcp-context-forge/security/advisories/GHSA-9hgc-g3w5-67cmx-refsource-confirm
https://github.com/IBM/mcp-context-forge/commit/fba11a99babd80779fa05510b35fb6a153bbacafx-refsource-misc
https://github.com/IBM/mcp-context-forge/releases/tag/v1.0.3x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.