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CVE-2026-55591— Signal K Server: Server-Side Request Forgery via Remote Connection Endpoints

Quick assessment

Affected
SignalK signalk-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Signal K Server 是一款运行于船舶中央集线器上的服务器应用程序。在 2.28.0 版本之前， 中的 函数从 、 和 端点接收由攻击者控制的 、 、 和 参数，且未对目标地址进行验证。当未配置安全设置时， 中的 成为空操作（no-op），导致上述三个端点均可在无认证情况下访问。 这允许服务器被强制联系环回（loopback）、私有地址、链路本地地址、云元数据服务或任意外部目标；并且 参数可以禁用出站 HTTPS 请求中的证书验证。 端点还将 直接拼接进目标路径，允许在所选主机上进行路径遍历，访问其他路径

CVSS 5.8 · Medium
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I. Basic Information for CVE-2026-55591

Vulnerability Information
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Vulnerability Title
Signal K Server: Server-Side Request Forgery via Remote Connection Endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
Signal K Server is a server application that runs on a central hub in a boat. Prior to 2.28.0, makeRemoteRequest() in src/serverroutes.ts accepted attacker-controlled host, port, useTLS, and selfsignedcert parameters from the testSignalKConnection, requestAccess, and checkAccessRequest endpoints without validating the destination. When security was not configured, addAdminMiddleware() was a no-op in dummysecurity.ts, leaving all three endpoints accessible without authentication. The server could be forced to contact loopback, private, link-local, cloud metadata, or arbitrary external destinations, and selfsignedcert could disable certificate verification for outbound HTTPS requests. The checkAccessRequest endpoint also interpolated requestId into its destination path, allowing traversal to other paths on the selected host. Distinct success, connection-refused, and timeout responses enabled internal port scanning; returned response bodies enabled cloud metadata and internal-service data exfiltration; requestAccess enabled server-side POST requests with attacker-controlled JSON; and access to cluster-internal services could support lateral movement. This issue is fixed in version 2.28.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
SignalK signalk-server < 2.28.0 -

II. Public POCs for CVE-2026-55591

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III. Intelligence Information for CVE-2026-55591

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Vendor Advisories for CVE-2026-55591 (1)

Vendor Pages for CVE-2026-55591 (1)

IV. Related Vulnerabilities

Same product: signalk-server
Same vendor: SignalK
Same weakness: CWE-918

V. Comments for CVE-2026-55591

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