InternLM lmdeploy API Server image_url server-side request forgery

Summaryinfo

A vulnerability was found in InternLM lmdeploy. It has been rated as problematic. The affected element is an unknown function of the component API Server. This manipulation of the argument image_url causes server-side request forgery. The identification of this vulnerability is CVE-2026-63764. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in InternLM lmdeploy (version unknown). It has been declared as problematic. Affected by this vulnerability is an unknown function of the component API Server. The manipulation of the argument image_url 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. The summary by CVE is:

lmdeploy's OpenAI-compatible API server contains a server-side request forgery vulnerability that allows unauthenticated attackers to access internal services and cloud metadata endpoints by supplying a crafted image_url that redirects to internal targets. Attackers can send a POST request to the chat completions endpoint with an image_url pointing to an attacker-controlled server that responds with an HTTP 302 redirect to internal addresses such as loopback or instance-metadata endpoints, bypassing the initial URL safety check because redirects are followed without re-validating each hop through the safety guard.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-63764 since 07/18/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/22/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• InternLM

Name

• lmdeploy

Website

• Product: https://github.com/InternLM/lmdeploy/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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