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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53708
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-14 16:17:11 UTC
Updated2026-09-14 17:17:46 UTC
DescriptionContextForge 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.

Risk And Classification

Primary CVSS: v3.1 6.6 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N

Problem Types: CWE-350 | CWE-367 | CWE-918 | CWE-350 CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action | CWE-367 CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.6MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N
3.1CNADECLARED6.6MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA IBM Mcp-context-forge affected < 1.0.3 Not specified
CNA IBM Mcp-contextforge-gateway affected < 1.0.3 Not specified

References

ReferenceSourceLinkTags
github.com/IBM/mcp-context-forge/releases/tag/v1.0.3 [email protected] github.com
github.com/IBM/mcp-context-forge/commit/fba11a99babd80779fa05510b35fb6a1... [email protected] github.com
github.com/IBM/mcp-context-forge/security/advisories/GHSA-9hgc-g3w5-67cm 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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