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CVE-2026-56676— 9router: Image prefetch DNS rebinding allows SSRF to internal services

Quick assessment

Affected
decolua 9router
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

decolua 9Router是decolua基金会的一个智能路由与降级的AI模型代理工具。 decolua 9Router 0.5.2之前版本存在安全漏洞，该漏洞源于图像URL验证和服务器端获取时DNS解析分离，可能导致经过身份验证的攻击者利用LLM代理和攻击者控制的DNS名称发起服务端请求伪造攻击。

CVSS 7.4 · High EPSS 0.26% · P16

Affected Version Matrix 1

VendorProduct Version RangeStatus
decolua 9router < 0.5.2 affected
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I. Basic Information for CVE-2026-56676

Vulnerability Information
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Vulnerability Title
9router: Image prefetch DNS rebinding allows SSRF to internal services
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
decolua 9router 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
decolua 9Router是decolua基金会的一个智能路由与降级的AI模型代理工具。 decolua 9Router 0.5.2之前版本存在安全漏洞，该漏洞源于图像URL验证和服务器端获取时DNS解析分离，可能导致经过身份验证的攻击者利用LLM代理和攻击者控制的DNS名称发起服务端请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
decolua 9router < 0.5.2 -

II. Public POCs for CVE-2026-56676

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9600 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-56676

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Patches & Fixes for CVE-2026-56676 (1)

Vendor Advisories for CVE-2026-56676 (1)

Other References for CVE-2026-56676 (1)

Same Patch Batch · decolua · 2026-07-10 · 6 CVEs total

CVE-2026-55500 9.9 CRITICAL 9router: Exposure of Sensitive Information and Unprotected Database Import/Export Allows C
CVE-2026-55638 8.6 HIGH 9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypass
CVE-2026-56675 8.3 HIGH 9router: Reverse proxy locality collapse allows unauthenticated access to 9router /v1 APIs
CVE-2026-55641 8.2 HIGH 9router: Unauthenticated `/v1` proxy access via `Host`-header spoofing → open AI relay + S
CVE-2026-55501 7.3 HIGH 9router: Login brute-force protection bypass via spoofed X-Forwarded-For header

IV. Related Vulnerabilities

Same product: 9router
Same vendor: decolua
Same weakness: CWE-367

V. Comments for CVE-2026-56676

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