TI-2026-40859 Aliases CVE-2026-56676 GHSA-cmhj-wh2f-9cgx

9router: Image prefetch DNS rebinding allows SSRF to internal services

HIGH 66CWE-367Published 2026-07-10 · Updated 2026-07-13

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · Low · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0019 8th percentileScored 2026-11-07

Fix Fixed 9router (decolua): 0.5.29router (npm): 0.5.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
decolua	9router	before 0.5.2	0.5.2	Patch available	CNA
—	9router (npm)	before 0.5.2	0.5.2	Patch available	GHSA-cmhj-wh2f-9cgx

9router Vendordecolua Affected before 0.5.2 Fixed in 0.5.2 Patch available CNA
9router (npm) Vendor— Affected before 0.5.2 Fixed in 0.5.2 Patch available GHSA-cmhj-wh2f-9cgx

Remediation

Fix · CNA 9router (decolua) Fixed in 0.5.2
Fix · GHSA-cmhj-wh2f-9cgx 9router (npm) Fixed in 0.5.2 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-56676
2026-10-03 Alias added: GHSA-cmhj-wh2f-9cgx

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-56676

Other 4

TI-2026-36526 9Router: Hardcoded Default fallback JWT Secret Allows Authentication Bypass CVSS 3.1CRITICAL 9.8
TI-2026-34059 9Router: Unauthenticated Remote Code Execution via unprotected MCP custom plugin routes CVSS 3.1CRITICAL 10.0
TI-2026-44499 9Router 0.4.41 - Unauthenticated API Key Exposure via /api/usage/stats CVSS 4.0CRITICAL 9.3
TI-2026-42622 9Router 0.4.41 - Unauthenticated API Exposure via /api/providers CVSS 4.0CRITICAL 9.3
TI-2026-44500 9Router 0.4.41 - Unauthenticated Information Disclosure via API Usage Endpoints CVSS 4.0HIGH 8.7
TI-2026-40860 9Router: Authenticated Server-Side Request Forgery (SSRF) via OIDC Provider Test Endpoint CVSS 3.1HIGH 8.6

See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences