CVE-2026-117518— fastify/reply-from 目录穿越漏洞
一分钟漏洞结论
影响对象
@fastify/reply-from @fastify/reply-from
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
是一个 Fastify 插件，用于将请求转发到上游 HTTP 服务器。在 12.8.0 及更早版本中，该插件仅针对正斜杠点段（forward-slash dot-segments）对代理路径进行验证，随后使用 WHATWG URL 解析器构建目标地址。该解析器会对 、 、 和 方案中的反斜杠及其百分号编码形式进行规范化，将其转换为正斜杠。因此，使用反斜杠点段的路径能够绕过遍历检查，解析为不同的上游路径。这导致原本限制代理范围于特定上游前缀、或依赖转发调用前的路由守卫的应用，可能使未认证请求逃逸出预期前缀，访问其他上
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一、 漏洞 CVE-2026-117518 基础信息
漏洞信息
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Vulnerability Title
@fastify/reply-from vulnerable to path traversal via backslash dot-segment prefix escape
来源: CVE Program / CVE List V5
Vulnerability Description
@fastify/reply-from is a Fastify plugin that forwards requests to an upstream HTTP server. In versions up to and including 12.8.0, the plugin validated proxy paths against forward-slash dot-segments only and then built the target with the WHATWG URL parser, which normalizes a backslash and its percent-encoded form to a forward slash on the http, https, ws, and wss schemes. A path that uses backslash dot-segments therefore bypasses the traversal check and resolves to a different upstream path, so an application that scopes proxying to an upstream prefix, or relies on route guards in front of the forwarding call, can have an unauthenticated request escape the intended prefix and reach other upstream endpoints. The resulting access to unintended upstream resources is primarily a confidentiality impact with limited integrity impact. The issue is fixed in @fastify/reply-from 12.8.1, where the path is normalized and any segment resolving to a single or double dot, along with control characters and ambiguous whitespace, is rejected before the URL is constructed, and users should upgrade to 12.8.1 or later. There is no workaround other than upgrading.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| @fastify/reply-from | @fastify/reply-from | 0 ~ 12.8.1 | - |
|
二、漏洞 CVE-2026-117518 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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