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

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

References
Link Providers
https://access.redhat.com/errata/RHSA-2026:25271 cve-icon
https://access.redhat.com/errata/RHSA-2026:25273 cve-icon
https://access.redhat.com/errata/RHSA-2026:26225 cve-icon
https://access.redhat.com/errata/RHSA-2026:26234 cve-icon
https://access.redhat.com/errata/RHSA-2026:28571 cve-icon
https://access.redhat.com/errata/RHSA-2026:29197 cve-icon
https://access.redhat.com/errata/RHSA-2026:29795 cve-icon
https://access.redhat.com/errata/RHSA-2026:29796 cve-icon
https://access.redhat.com/errata/RHSA-2026:29800 cve-icon
https://access.redhat.com/errata/RHSA-2026:29834 cve-icon
https://access.redhat.com/errata/RHSA-2026:30076 cve-icon
https://access.redhat.com/errata/RHSA-2026:33683 cve-icon
https://access.redhat.com/errata/RHSA-2026:34160 cve-icon
https://access.redhat.com/errata/RHSA-2026:34342 cve-icon
https://access.redhat.com/errata/RHSA-2026:34374 cve-icon
https://access.redhat.com/errata/RHSA-2026:34766 cve-icon
https://access.redhat.com/errata/RHSA-2026:34770 cve-icon
https://access.redhat.com/errata/RHSA-2026:36651 cve-icon
https://access.redhat.com/errata/RHSA-2026:36754 cve-icon
https://access.redhat.com/errata/RHSA-2026:37186 cve-icon
https://access.redhat.com/errata/RHSA-2026:37385 cve-icon
https://access.redhat.com/errata/RHSA-2026:37628 cve-icon
https://access.redhat.com/errata/RHSA-2026:40118 cve-icon
https://access.redhat.com/errata/RHSA-2026:40945 cve-icon
https://access.redhat.com/errata/RHSA-2026:41066 cve-icon
https://access.redhat.com/errata/RHSA-2026:41928 cve-icon
https://access.redhat.com/errata/RHSA-2026:41951 cve-icon
https://access.redhat.com/errata/RHSA-2026:42078 cve-icon
https://access.redhat.com/errata/RHSA-2026:42142 cve-icon
https://access.redhat.com/errata/RHSA-2026:43038 cve-icon
https://access.redhat.com/errata/RHSA-2026:54395 cve-icon
https://access.redhat.com/security/cve/CVE-2026-6322 cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2466684 cve-icon
https://cna.openjsf.org/security-advisories.html cve-icon cve-icon
https://github.com/fastify/fast-uri/security/advisories/GHSA-v39h-62p7-jpjc cve-icon cve-icon
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6322.json cve-icon
History

Thu, 13 Aug 2026 13:30:00 +0000

Type Values Removed Values Added
References

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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: openjs

Published:

Updated: 2026-08-13T12:04:31.205Z

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

Link: CVE-2026-6322

cve-icon Vulnrichment

Updated: 2026-08-13T12:04:31.205Z

cve-icon NVD

Status : Modified

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

Modified: 2026-08-13T13:19:15.657

Link: CVE-2026-6322

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-14T04:30:17Z

Weaknesses