CVE-2026-76172— fast-uri 主机混淆漏洞（百分编码方案标准化）
一分钟漏洞结论
影响对象
fast-uri fast-uri
利用判断
存在公开或 AI PoC，应优先验证
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。
fast-uri 是用于 Node.js 的 URI 解析器。在解析过程中，它会对 URI 的 scheme（协议）部分执行一次遗留的解码操作，且不再对解码结果进行重新转义；而序列化时，scheme 部分会原样输出，这与主机（host）组件的处理方式不同（主机组件会被重新转义）。因此，对于 scheme 中包含经过百分号编码的斜杠字符（ 或 ）的输入，解析后得到的 scheme 没有 Authority 部分，导致解析结果中的主机（host）和错误信息均为 undefined。然而，对该输入进行解析或标准化（nor
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application
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一、 漏洞 CVE-2026-76172 基础信息
漏洞信息
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Vulnerability Title
fast-uri vulnerable to host confusion via percent-encoded scheme normalization
来源: CVE Program / CVE List V5
Vulnerability Description
fast-uri is a URI parser for Node.js. During parsing it runs a legacy decoding pass over the scheme component and never re-escapes the result, and serialization writes the scheme back out verbatim, unlike the host component which is re-escaped. As a result an input whose scheme carries percent-encoded slashes parses as a scheme with no authority, so the parsed host and error are both undefined, yet resolving or normalizing that same input emits a network-path reference whose authority is attacker-chosen and re-parses to that host. An application that allowlists on the parsed host, or treats a reference with no authority as safe to resolve against its base, gets the opposite of what it checked, giving an off-site redirect, server-side request forgery, or address-policy bypass. The legacy decoder also expands non-standard escape forms, widening the issue past upstream filters, and control characters in the scheme can reach the output as raw carriage return and line feed. The affected versions are 2.3.1 up to but not including 2.4.5, 3.0.0 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which reject a scheme that is not valid after decoding. Users should upgrade to a patched version.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
URL编码处理不恰当(Hex编码)
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-76172 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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高级
Qwen3.6-35B-A3B
· 6086 chars
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三、漏洞 CVE-2026-76172 的情报信息
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CVE-2026-76172 厂商安全公告 (1)
同批安全公告 · fast-uri · 2026-08-24 · 共 4 条
| CVE-2026-75899 | 7.5 HIGH | fast-uri 服务器端请求伪造漏洞 |
| CVE-2026-75931 | 7.5 HIGH | fast-uri IDN规范化跳过导致主机混淆漏洞 |
| CVE-2026-75975 | 7.5 HIGH | fast-uri 畸形IPv6规范化导致服务器端请求伪造漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-76172
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