Description
fast-uri normalize() decoded percent-encoded authority delimiters inside the host component and then re-emitted them as raw delimiters during serialization. A host that combined an allowed domain, an encoded at-sign, and a different domain was re-emitted with the at-sign as a raw userinfo separator, changing the URI's authority to the second domain. Applications that normalize untrusted URLs before host allowlist checks, redirect validation, or outbound request routing can be steered to a different authority than the input appeared to specify. Versions <= 3.1.1 are affected. Update to 3.1.2 or later.
Published: 2026-05-05
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-v39h-62p7-jpjc fast-uri vulnerable to host confusion via percent-encoded authority delimiters
History

Tue, 12 May 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Openjsf
Openjsf fast-uri
CPEs cpe:2.3:a:openjsf:fast-uri:*:*:*:*:*:node.js:*:*
Vendors & Products Openjsf
Openjsf fast-uri

Wed, 06 May 2026 09:45:00 +0000

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

Tue, 05 May 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 05 May 2026 10:45:00 +0000

Type Values Removed Values Added
Description fast-uri normalize() decoded percent-encoded authority delimiters inside the host component and then re-emitted them as raw delimiters during serialization. A host that combined an allowed domain, an encoded at-sign, and a different domain was re-emitted with the at-sign as a raw userinfo separator, changing the URI's authority to the second domain. Applications that normalize untrusted URLs before host allowlist checks, redirect validation, or outbound request routing can be steered to a different authority than the input appeared to specify. Versions <= 3.1.1 are affected. Update to 3.1.2 or later.
Title fast-uri vulnerable to host confusion via percent-encoded authority delimiters
Weaknesses CWE-436
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}


Subscriptions

Fast-uri Fast-uri
Openjsf Fast-uri
cve-icon MITRE

Status: PUBLISHED

Assigner: openjs

Published:

Updated: 2026-05-05T12:55:43.750Z

Reserved: 2026-04-14T20:28:09.160Z

Link: CVE-2026-6322

cve-icon Vulnrichment

Updated: 2026-05-05T12:55:34.327Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-05T11:16:33.360

Modified: 2026-05-12T19:11:31.980

Link: CVE-2026-6322

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-06T09:21:50Z

Weaknesses