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.
Published: 2026-10-20
Score: 3.7 Low
EPSS: < 1% Very Low
KEV: No
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Remediation

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History

Tue, 20 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
First Time appeared Fast-uri
Fast-uri fast-uri
Vendors & Products Fast-uri
Fast-uri fast-uri

Tue, 20 Oct 2026 12:45:00 +0000

Type Values Removed Values Added
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.
Title fast-uri vulnerable to scheme injection via an unescaped first-segment colon in suffix references
Weaknesses CWE-116
CWE-41
CWE-79
References
Metrics threat_severity

None

 cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}

threat_severity

Low

Subscriptions

Fast-uri Fast-uri
cve-icon MITRE

Status: PUBLISHED

Assigner: openjs

Published:

Updated: 2026-10-20T19:14:41.685Z

Reserved: 2026-10-14T14:53:33.214Z

Link: CVE-2026-110725

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T07:17:08.937

Modified: 2026-10-20T20:17:16.123

Link: CVE-2026-110725

cve-icon Redhat

Severity : Low

Publid Date: 2026-10-20T07:06:29Z

Links: CVE-2026-110725 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-20T16:15:14Z

Weaknesses
  • CWE-116

    Improper Encoding or Escaping of Output

  • CWE-41

    Improper Resolution of Path Equivalence

  • CWE-79

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')