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CVE-2026-72860— 9router Server-Side Request Forgery via /api/provider-nodes/validate Because the IPv4-Mapped IPv6 Denylist Check Is Unreachable

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个人开发者的一个智能路由与降级的AI模型代理工具。 decolua 9Router 0.5.55及之前版本存在安全漏洞，该漏洞源于对目标URL的校验不充分，可能导致服务端请求伪造，攻击者能够访问回环地址和链路本地元数据地址，并泄露内部响应信息。

CVSS 8.5 · High EPSS 0.38% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
decolua 9router ≤ 0.5.55 affected
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I. Basic Information for CVE-2026-72860

Vulnerability Information
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Vulnerability Title
9router Server-Side Request Forgery via /api/provider-nodes/validate Because the IPv4-Mapped IPv6 Denylist Check Is Unreachable
Source: CVE Program / CVE List V5
Vulnerability Description
The POST /api/provider-nodes/validate route in 9router takes a caller-supplied baseUrl and issues server-side HTTP requests to it, guarding the destination with assertPublicUrl from src/shared/utils/ssrfGuard.js. That guard compares hostname strings only: it resolves no DNS, does not revalidate after a redirect, and its IPv4-mapped IPv6 branch is unreachable. The branch matches ^::ffff:(\d+\.\d+\.\d+\.\d+)$, but the WHATWG URL parser canonicalizes such literals to hextets before the guard runs, so new URL("http://[::ffff:127.0.0.1]/").hostname yields [::ffff:7f00:1] and the pattern is tested against a string it is never handed. Every IPv4-mapped address therefore passes, and http://[::ffff:7f00:1] and http://[::ffff:a9fe:a9fe] reach loopback and link-local metadata addresses; a hostname whose A record points at an internal address passes as well because no resolution occurs. In the custom-embedding branch the upstream response body is truncated to 200 bytes and returned to the caller whenever the upstream status is neither 2xx nor 401 nor 403, which discloses the beginning of internal responses, and the other validation types remain usable for blind internal port scanning through status and timing differences. The caller-supplied apiKey is forwarded to the internal destination as an Authorization Bearer header. A dashboard session is required by default, and none is required when requireLogin is disabled.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
decolua 9Router 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
decolua 9Router是decolua个人开发者的一个智能路由与降级的AI模型代理工具。 decolua 9Router 0.5.55及之前版本存在安全漏洞，该漏洞源于对目标URL的校验不充分，可能导致服务端请求伪造，攻击者能够访问回环地址和链路本地元数据地址，并泄露内部响应信息。
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 ~ 0.5.55 -

II. Public POCs for CVE-2026-72860

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
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claude_code · 10356 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-72860

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Patches & Fixes for CVE-2026-72860 (3)

Vendor Advisories for CVE-2026-72860 (1)

Proof of Concept for CVE-2026-72860 (1)

IV. Related Vulnerabilities

Same product: 9router
Same vendor: decolua
Same weakness: CWE-918

V. Comments for CVE-2026-72860

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