Portkey-AI Gateway up to 1.13.x Request Header x-portkey-custom-host server-side request forgery

Summaryinfo

A vulnerability identified as critical has been detected in Portkey-AI Gateway up to 1.13.x. This affects an unknown function of the component Request Header Handler. This manipulation of the argument x-portkey-custom-host causes server-side request forgery. The identification of this vulnerability is CVE-2025-66405. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Portkey-AI Gateway up to 1.13.x. It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component Request Header Handler. The manipulation of the argument x-portkey-custom-host with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Portkey.ai Gateway is a blazing fast AI Gateway with integrated guardrails. Prior to 1.14.0, the gateway determined the destination baseURL by prioritizing the value in the x-portkey-custom-host request header. The proxy route then appends the client-specified path to perform an external fetch. This can be maliciously used by users for SSRF attacks. This vulnerability is fixed in 1.14.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-66405 since 11/29/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.14.0 eliminates this vulnerability. Applying the patch b5a7825ba5f4e6918deb32d9969899ce2229a885 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• Portkey-AI

Name

• Gateway

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13

License

• open-source

Website

• Product: https://github.com/Portkey-AI/gateway/

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