fast-uri vulnerable to scheme injection via an unescaped first-segment colon in suffix references
Summary
| CVE | CVE-2026-110725 |
|---|---|
| State | PUBLISHED |
| Assigner | openjs |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-20 07:17:08 UTC |
| Updated | 2026-10-20 20:17:16 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 3.7 LOW from ce714d77-add3-4f53-aff5-83d477b104bb
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS: 0.002540000 probability, percentile 0.159390000 (date 2026-10-20)
Problem Types: CWE-41 | CWE-116 | CWE-41 CWE-41: Improper Resolution of Path Equivalence | CWE-116 CWE-116: Improper Encoding or Escaping of Output
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ce714d77-add3-4f53-aff5-83d477b104bb | Secondary | 3.7 | LOW | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N |
| 3.1 | CNA | CVSS | 3.7 | LOW | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Fast-uri | Fast-uri | affected 2.4.8 semver | Not specified |
| CNA | Fast-uri | Fast-uri | unaffected 2.4.8 semver | Not specified |
| CNA | Fast-uri | Fast-uri | affected 3.0.0 3.1.9 semver | Not specified |
| CNA | Fast-uri | Fast-uri | unaffected 3.1.9 semver | Not specified |
| CNA | Fast-uri | Fast-uri | affected 4.0.0 4.2.3 semver | Not specified |
| CNA | Fast-uri | Fast-uri | unaffected 4.2.3 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| cna.openjsf.org/security-advisories.html | ce714d77-add3-4f53-aff5-83d477b104bb | cna.openjsf.org | |
| github.com/fastify/fast-uri/security/advisories/GHSA-333x-w4r6-6crp | ce714d77-add3-4f53-aff5-83d477b104bb | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: UlisesGascon (en)
CNA: mcollina (en)
There are currently no legacy QID mappings associated with this CVE.