Unrated

DNS rebinding SSRF protection bypass in ContextForge Gateway

IdentifiersCVE-2026-53708CWE-367

CVE-2026-53708 is a time-of-check time-of-use race condition in ContextForge Gateway affecting the /admin/gateways/test endpoint. The flaw arises from DNS being validated at one point and the hostname being resolved again when the outbound connection is made, allowing an attacker to exploit DNS rebinding and cause the application to connect to a different IP address than the one originally validated. This breaks the intended SSRF protections on the endpoint and can permit requests to internal or otherwise restricted destinations. In affected deployments, the issue can expose internal services and APIs and may allow access to cloud instance metadata services when reachable.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an attacker with a credential that has explicit gateways.read permission to bypass SSRF protections and use the vulnerable endpoint as a proxy to reach internal network resources. This can enable internal network scanning, access to internal services and APIs, and retrieval of sensitive metadata from cloud instance metadata services. In environments where instance metadata is exposed in a weakly protected configuration such as IMDSv1, the vulnerability can lead to theft of cloud credentials and potentially full compromise of the associated cloud account.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, disable the administrative API when it is not needed, restrict access to the /admin/gateways/test endpoint, and tightly limit issuance of credentials that include explicit gateways.read permission. Additionally, enforce network-layer egress controls to block outbound access from the application to internal address ranges and cloud metadata services.

Remediation

Patch, then assume compromise.

Upgrade mcp-contextforge-gateway to version 1.0.3 or later. The remediation should ensure that outbound connections are pinned to the IP address that was validated during the DNS check, rather than performing a fresh resolution at connection time. Implementations may use a custom transport or resolver that preserves the validated destination while retaining the original Host header behavior where required.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

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0 SOURCESView more in app

No public activity observed for this vulnerability.

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Exposure mapping

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Threat actor evidence

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Associated malware

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Detection signatures

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Vendor-by-vendor mapping

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Social activity