CVE-2026-56676 decolua CVE debrief

Who should care

Users of 9Router, an AI router & token saver, should be aware of this high-severity vulnerability and take steps to mitigate it. This vulnerability requires authentication and access to the LLM proxy, but can allow for server-side requests to internal-only HTTP services. Affected operators, platform administrators, vulnerability management teams, and security teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

The vulnerability exists in 9Router, an AI router & token saver, due to inconsistent DNS resolution. The application 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. This allows an authenticated attacker with access to the LLM proxy to 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. This enables server-side requests to internal-only HTTP services.

Defensive priority

High

Recommended defensive actions

• Upgrade to version 0.5.2 or later
• Restrict access to the LLM proxy
• Monitor for suspicious activity
• Implement compensating controls, such as firewall rules or intrusion detection systems
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-10T16:16:34.923Z and has not been modified since then. The NVD entry is currently Deferred. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. The vulnerability exists in 9Router, an AI router & token saver, due to inconsistent DNS resolution. This allows an authenticated attacker with access to the LLM proxy to 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, enabling server-side requests to internal-only HTTP services.

Official resources