decolua 9router up to 0.5.1 Image Fetch image.js server-side request forgery

Summaryinfo

A vulnerability, which was classified as problematic, has been found in decolua 9router up to 0.5.1. Impacted is an unknown function of the file open-sse/translator/concerns/image.js of the component Image Fetch Handler. The manipulation leads to server-side request forgery. This vulnerability is referenced as CVE-2026-56676. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in decolua 9router up to 0.5.1. This issue affects an unknown functionality of the file open-sse/translator/concerns/image.js of the component Image Fetch Handler. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality. The summary by CVE is:

9Router is an AI router & token saver. Prior to 0.5.2, 9router validates image URLs by resolving the host before fetching, but open-sse/translator/concerns/image.js performs the later server-side image fetch with a separate DNS resolution. An authenticated attacker with access to the LLM proxy can use a vision-capable model and an attacker-controlled DNS name that first resolves to a public IP and then rebinds to an internal address, allowing server-side requests to internal-only HTTP services. This issue is fixed in version 0.5.2.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-56676 since 06/22/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available.

Upgrading to version 0.5.2 eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• decolua

Name

• 9router

Version

• 0.5.0
• 0.5.1

Website

• Product: https://github.com/decolua/9router/

CPE 2.3info

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CPE 2.2info

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