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CVE-2026-84292— fast-uri vulnerable to authority injection via an unvalidated port in serialize

Quick assessment

Affected
fast-uri fast-uri
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.

在序列化 URI 的端口（port）组件时未对其进行验证。在重组 authority（权威部分）时，userinfo 和 host 组件会被转义，但端口值被原样拼接。因此，如果端口值不是纯数字序列，就可以注入 authority 分隔符，从而将原本的主机降级为 userinfo，并使 authority 指向攻击者可控的主机。由于 和 Node.js 的 解析该结果时都不会报错，因此通过重新验证已构建的 URI 也无法捕获此问题。 该漏洞影响那些通过 、 或 函数的对象形式构建 URI、并将不可信数据赋值给端口组件

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1567 · Exfiltration Over Web Service
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I. Basic Information for CVE-2026-84292

Vulnerability Information
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Vulnerability Title
fast-uri vulnerable to authority injection via an unvalidated port in serialize
Source: CVE Program / CVE List V5
Vulnerability Description
fast-uri serializes the port component of a URI without validating it. When recomposing the authority, the userinfo and host components are escaped but the port is concatenated verbatim, so a port value that is not a sequence of digits can inject authority delimiters, demoting the intended host to userinfo and pointing the authority at an attacker-controlled host. Both fast-uri and Node's URL read the result back as the attacker's host with no error, so re-validating the built URI does not catch it. This affects applications that build URIs from parts and assign untrusted data to the port component through the serialize, normalize, or equal functions in their object forms. The issue affects fast-uri versions before 2.4.6, from 3.0.0 before 3.1.7, and from 4.0.0 before 4.1.4. It is fixed in 2.4.6, 3.1.7, and 4.1.4, where recomposeAuthority rejects any port that is not a digit sequence per RFC 3986.
Source: 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
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
fast-uri fast-uri 0 ~ 2.4.6 -

II. Public POCs for CVE-2026-84292

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III. Intelligence Information for CVE-2026-84292

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Vendor Advisories for CVE-2026-84292 (1)

IV. Related Vulnerabilities

Same product: fast-uri
Same vendor: fast-uri
Same weakness: CWE-116

V. Comments for CVE-2026-84292

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