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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.

Fastify fast-uri是Fastify团队的一个URI解析工具。 Fastify fast-uri 2.4.6之前版本、3.0.0至3.1.7之前版本和4.0.0至4.1.4之前版本存在输出处理不当漏洞，该漏洞源于fast-uri在序列化URI的端口组件时未进行有效性验证，导致非数字端口值可注入authority分隔符，将预期主机指向攻击者控制的主机。

CVSS 7.5 · High EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1567 · Exfiltration Over Web Service

Affected Version Matrix 6

VendorProduct Version RangeStatus
fast-uri fast-uri < 2.4.6 affected
2.4.6 unaffected
3.0.0< 3.1.7 affected
3.1.7 unaffected
4.0.0< 4.1.4 affected
4.1.4 unaffected
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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
Vulnerability Title
Fastify fast-uri 输出处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fastify fast-uri是Fastify团队的一个URI解析工具。 Fastify fast-uri 2.4.6之前版本、3.0.0至3.1.7之前版本和4.0.0至4.1.4之前版本存在输出处理不当漏洞，该漏洞源于fast-uri在序列化URI的端口组件时未进行有效性验证，导致非数字端口值可注入authority分隔符，将预期主机指向攻击者控制的主机。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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