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CVE-2026-76172— Fastify fast-uri 输入验证错误漏洞

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。

Fastify fast-uri是Fastify团队的一个URI解析工具。 Fastify fast-uri 2.3.1至2.4.5之前版本、3.0.0至3.1.6之前版本和4.0.0至4.1.3之前版本存在输入验证错误漏洞,该漏洞源于对URI的scheme组件进行解码后未重新转义,可能导致站外重定向、服务端请求伪造或地址策略绕过。

CVSS 7.5 · High EPSS 0.23% · P13

影响版本矩阵 6

厂商产品 版本范围状态
fast-uri fast-uri 2.3.1< 2.4.5 affected
2.4.5 unaffected
3.0.0< 3.1.6 affected
3.1.6 unaffected
4.0.0< 4.1.3 affected
4.1.3 unaffected
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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
Vulnerability Title
Fastify fast-uri 输入验证错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Fastify fast-uri是Fastify团队的一个URI解析工具。 Fastify fast-uri 2.3.1至2.4.5之前版本、3.0.0至3.1.6之前版本和4.0.0至4.1.3之前版本存在输入验证错误漏洞,该漏洞源于对URI的scheme组件进行解码后未重新转义,可能导致站外重定向、服务端请求伪造或地址策略绕过。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
fast-uri fast-uri 2.3.1 ~ 2.4.5 -

二、漏洞 CVE-2026-76172 的公开POC

# POC 描述 源链接 神龙链接
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已在真实靶场复现成功 · 下方是搭建环境并实际触发漏洞的真实录像。
成功标志: VULNERABLE: proof_38e5d2e652b08d41 - attacker host exfiltrated through the resolved reference (PROOF_38e5d2e652b08d41)
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claude_code · 2699 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 Fastify fast-uri 服务端请求伪造漏洞
CVE-2026-75931 7.5 HIGH Fastify fast-uri 处理逻辑错误漏洞
CVE-2026-75975 7.5 HIGH Fastify fast-uri 输入验证错误漏洞

IV. Related Vulnerabilities

V. Comments for CVE-2026-76172

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