CVE-2026-75931— fast-uri IDN规范化跳过导致主机混淆漏洞
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 Node.js 的一个 URI 解析器。仅当输入中包含显式协议（scheme）时，它才会将主机名规范化为 ASCII 形式；而对于类似双斜杠开头的协议相对引用（scheme-relative reference），它会按原样返回主机名，且不设置任何错误。因此，fast-uri 的各个入口函数行为不一致：parse、resolve、normalize 和 equal 函数对于相同的输入，可能仅因是否显式写出协议而产生不同的主机名结果；even equal 函数对相同的主机名对可能返回相反的判定结
可能的 ATT&CK 技术 1 AI
T1518.001 · Security Software Discovery
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一、 漏洞 CVE-2026-75931 基础信息
漏洞信息
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Vulnerability Title
fast-uri vulnerable to host confusion via skipped IDN canonicalization on scheme-relative references
来源: CVE Program / CVE List V5
Vulnerability Description
fast-uri is a URI parser for Node.js. It canonicalizes a host to its ASCII form only when the input carries an explicit scheme, so a scheme-relative reference such as a host preceded by two slashes is returned with its host verbatim and no error set. As a result fast-uri's own entry points disagree with each other: parse, resolve, normalize, and equal can yield different hosts for the same input depending only on whether a scheme is written out, and equal can return opposite verdicts for the same pair of hosts. An application that extracts a host with fast-uri to check it against a policy list and then resolves the same reference can make its decision on one host while the destination is another, enabling host confusion and policy bypass. The affected versions are 2.4.2 up to but not including 2.4.5, 3.1.3 up to but not including 3.1.6, and 4.0.1 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which canonicalize the host consistently across the resolve path. 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
解释冲突
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-75931 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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高级
Qwen3.6-35B-A3B
· 6649 chars
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三、漏洞 CVE-2026-75931 的情报信息
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CVE-2026-75931 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-2026-75975 | 7.5 HIGH | fast-uri 畸形IPv6规范化导致服务器端请求伪造漏洞 |
| CVE-2026-76172 | 7.5 HIGH | fast-uri 主机混淆漏洞（百分编码方案标准化） |
IV. Related Vulnerabilities
V. Comments for CVE-2026-75931
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