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CVE-2026-110725— fast-uri vulnerable to scheme injection via an unescaped first-segment colon in suffix references

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.

fast-uri 是一个无依赖的、遵循 RFC 3986 标准的 Node.js URI 解析与序列化库。在 2.4.8 之前的版本、3.0.0 至 3.1.8 的版本，以及 4.0.0 至 4.2.2 的版本中，当调用 serialize()、normalize() 或 resolve() 方法，并将非默认选项 reference 设置为 suffix，且处理的是一个不包含权威部分（authority）的引用时，生成的相对引用可能在其路径段的首部包含未转义的裸冒号（:）。然而，RFC 3986 明确禁止此类情况，

CVSS 3.7 · Low
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I. Basic Information for CVE-2026-110725

Vulnerability Information
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Vulnerability Title
fast-uri vulnerable to scheme injection via an unescaped first-segment colon in suffix references
Source: CVE Program / CVE List V5
Vulnerability Description
fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js. In versions before 2.4.8, from 3.0.0 through 3.1.8, and from 4.0.0 through 4.2.2, when serialize(), normalize(), or resolve() are called with the non-default option reference set to suffix on a reference that has no authority, the emitted relative reference can contain a bare colon in its first path segment without escaping it, even though RFC 3986 forbids that because it makes the string reparse as an absolute URI with a scheme. An application that serializes or normalizes a relative reference with the suffix option and then treats the result as a URI can turn inert input into a live javascript, data, or vbscript URL, a cross-site scripting vector, and the equal() comparison can conflate a scheme-bearing reference with a relative one. Exposure is limited to applications using the non-default suffix reference option. The issue is fixed in fast-uri 2.4.8, 3.1.9, and 4.2.3, and users should upgrade to one of these versions or later. As a workaround, avoid the suffix reference option on untrusted input, or percent-encode a colon in the first path segment of the result before treating it as a URI.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径等价的解析不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
fast-uri fast-uri 0 ~ 2.4.8 -

II. Public POCs for CVE-2026-110725

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III. Intelligence Information for CVE-2026-110725

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Vendor Advisories for CVE-2026-110725 (1)

Same Patch Batch · fast-uri · 2026-10-20 · 4 CVEs total

CVE-2026-110306 6.1 MEDIUM fast-uri vulnerable to URI scheme spoofing via percent-encoded scheme decoding
CVE-2026-110180 4.8 MEDIUM fast-uri vulnerable to host confusion via unchecked WHATWG host canonicalization
CVE-2026-110095 3.7 LOW fast-uri vulnerable to improper path equivalence in relative reference normalization

IV. Related Vulnerabilities

Same product: fast-uri
Same vendor: fast-uri
Same weakness: CWE-41

V. Comments for CVE-2026-110725

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