fast-uri vulnerable to host confusion via percent-encoded authority delimiters
Impact
fast-uri v3.1.1 and earlier decodes percent-encoded authority delimiters (%40 as @, %3A as :) inside the host component and serializes them back as raw characters. This changes the URI structure, turning a hostname into userinfo plus a different host.
For example, http://trusted.com%40evil.com/ normalizes to http://trusted.com@evil.com/, which reparses as host evil.com with userinfo trusted.com.
Applications that normalize untrusted URLs before host allowlist checks, redirect validation, or outbound request routing can be steered to a different authority than the original URL appeared to contain.
Patches
Upgrade to fast-uri >= 3.1.2, or if you are in the v2.x release line, v2.4.1
Workarounds
None. Upgrade to the patched version.
Betroffene Software
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| Plattform | Paket | Anfällige Versionen | Behoben in |
|---|---|---|---|
| npm-Paket | fast-uri | >= 3.0.0, < 3.1.2, < 2.4.1 | 3.1.2, 2.4.1 |
Verweise
- https://github.com/fastify/fast-uri/security/advisories/GHSA-v39h-62p7-jpjc
- https://nvd.nist.gov/vuln/detail/CVE-2026-6322
- https://access.redhat.com/errata/RHSA-2026:41928
- https://access.redhat.com/errata/RHSA-2026:41951
- https://access.redhat.com/errata/RHSA-2026:42078
- https://access.redhat.com/errata/RHSA-2026:42142
- https://access.redhat.com/errata/RHSA-2026:43038
- https://access.redhat.com/errata/RHSA-2026:54395
- https://access.redhat.com/errata/RHSA-2026:54555
- https://access.redhat.com/errata/RHSA-2026:56366
- https://access.redhat.com/errata/RHSA-2026:56431
- https://access.redhat.com/errata/RHSA-2026:56928
- https://access.redhat.com/errata/RHSA-2026:56968
- https://access.redhat.com/errata/RHSA-2026:57013
- https://access.redhat.com/errata/RHSA-2026:57487
- https://access.redhat.com/errata/RHSA-2026:60520
- https://access.redhat.com/errata/RHSA-2026:60855
- https://access.redhat.com/errata/RHSA-2026:61783
- https://access.redhat.com/security/cve/CVE-2026-6322
- https://bugzilla.redhat.com/show_bug.cgi?id=2466684
- https://cna.openjsf.org/security-advisories.html
- https://github.com/fastify/fast-uri
- https://github.com/fastify/fast-uri/releases/tag/v2.4.1
- https://github.com/fastify/fast-uri/releases/tag/v3.1.2
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6322.json
- https://access.redhat.com/errata/RHSA-2026:25271
- https://access.redhat.com/errata/RHSA-2026:25273
- https://access.redhat.com/errata/RHSA-2026:26225
- https://access.redhat.com/errata/RHSA-2026:26234
- https://access.redhat.com/errata/RHSA-2026:28571
- https://access.redhat.com/errata/RHSA-2026:29197
- https://access.redhat.com/errata/RHSA-2026:29795
- https://access.redhat.com/errata/RHSA-2026:29796
- https://access.redhat.com/errata/RHSA-2026:29800
- https://access.redhat.com/errata/RHSA-2026:29834
- https://access.redhat.com/errata/RHSA-2026:30076
- https://access.redhat.com/errata/RHSA-2026:33683
- https://access.redhat.com/errata/RHSA-2026:34160
- https://access.redhat.com/errata/RHSA-2026:34342
- https://access.redhat.com/errata/RHSA-2026:34374
- CVSS-Vektor
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N- Schwäche (CWE)
CWE-140, CWE-436- Plattform
- npm
- Paket
fast-uri- Veröffentlicht
- 08.05.2026
- Aktualisiert
- 11.10.2026 10:22
Quellen und Lizenzen
OSV / GitHub Advisory Database - GHSA-v39h-62p7-jpjc - CC BY 4.0
Schwachstellenhistorie: fast-uri
Alle veröffentlichten Schwachstellen dieses Pakets (npm-Paket), neueste zuerst. Zeigt, ob es ein einmaliger Ausrutscher ist oder ein Paket, das man im Auge behalten muss.
- Einträge insgesamt
- 13
- Erste → letzte
- 05.2026 09.2026
- Ohne Fix
- 0
- In Angriffen ausgenutzt
- 0
Verteilung nach Schweregrad
- Hoch 11
- Mittel 2
Veröffentlichungen pro Jahr
- 2026: 13
-
fast-uri vulnerable to host confusion via percent-encoded authority delimiters dieser Eintrag
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