Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/decolua/9router/commit/c7d07448c58bec1200741de0b73305b860416b
- https://github.com/decolua/9router/releases/tag/v0.5.2
- https://github.com/decolua/9router/security/advisories/GHSA-cmhj-wh2f-9cgx
- https://github.com/decolua/9router/security/advisories/GHSA-cmhj-wh2f-9cgx
FAQ
What is CVE-2026-56676?
CVE-2026-56676 is a vulnerability with a CVSS score of 7.4 (HIGH). 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 imag...
How severe is CVE-2026-56676?
CVE-2026-56676 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56676?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.