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CVE-2026-55641— 9router: Unauthenticated `/v1` proxy access via `Host`-header spoofing → open AI relay + SSRF

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，该漏洞源于读取客户端控制的Host标头，允许远程未经验证攻击者通过发送Host: localhost绕过API密钥身份验证，并利用searxng provider_options.baseUrl参数向内部或云元数据主机发出服务端请求。

CVSS 8.2 · High EPSS 0.32% · P23

Affected Version Matrix 1

VendorProduct Version RangeStatus
decolua 9router < 0.5.2 affected
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I. Basic Information for CVE-2026-55641

Vulnerability Information
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Vulnerability Title
9router: Unauthenticated `/v1` proxy access via `Host`-header spoofing → open AI relay + SSRF
Source: CVE Program / CVE List V5
Vulnerability Description
9Router is an AI router & token saver. Prior to 0.5.2, 9router determines whether a /v1 LLM proxy request is local by reading the client-controlled Host header, allowing a remote unauthenticated attacker to send Host: localhost and bypass API-key authentication. In the default configuration, this exposes the /v1 proxy to upstream provider calls using stored provider credentials and allows /v1/search with the searxng provider_options.baseUrl parameter to drive server-side requests to internal or cloud-metadata hosts. 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:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
decolua 9router 配置错误漏洞
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，该漏洞源于读取客户端控制的Host标头，允许远程未经验证攻击者通过发送Host: localhost绕过API密钥身份验证，并利用searxng provider_options.baseUrl参数向内部或云元数据主机发出服务端请求。
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-2026-55641

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 4930 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-55641

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Patches & Fixes for CVE-2026-55641 (1)

Vendor Advisories for CVE-2026-55641 (1)

Other References for CVE-2026-55641 (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-2026-56676 7.4 HIGH 9router: Image prefetch DNS rebinding allows SSRF to internal services
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-290

V. Comments for CVE-2026-55641

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