> CVE-2026-76172 [HIGH]

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PUBLISHED
2026-08-24 11:16
MODIFIED
2026-08-24 11:16
CVSS_SCORE V3
7.5
EPSS (Prob. Exploit)
0.23%
Top 86.9%
DATA SOURCES:
NVD 🔗 2026-08-24 RED HAT 🔗 2026-08-30 CWE MITRE 🔗 2026-09-01 FIRST EPSS 🔗 2026-10-18 GITHUB 🔗 2026-10-15 OSV 🔗 2026-10-26

> DESCRIPTION

fast-uri is a URI parser for Node.js. During parsing it runs a legacy decoding pass over the scheme component and never re-escapes the result, and serialization writes the scheme back out verbatim, unlike the host component which is re-escaped. As a result an input whose scheme carries percent-encoded slashes parses as a scheme with no authority, so the parsed host and error are both undefined, yet resolving or normalizing that same input emits a network-path reference whose authority is attacker-chosen and re-parses to that host. An application that allowlists on the parsed host, or treats a reference with no authority as safe to resolve against its base, gets the opposite of what it checked, giving an off-site redirect, server-side request forgery, or address-policy bypass. The legacy decoder also expands non-standard escape forms, widening the issue past upstream filters, and control characters in the scheme can reach the output as raw carriage return and line feed. The affected versions are 2.3.1 up to but not including 2.4.5, 3.0.0 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which reject a scheme that is not valid after decoding. Users should upgrade to a patched version.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EXPLOITABILITY
3.9
IMPACT
3.6

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-177

> CWE DETAILED DESCRIPTIONS

CWE-177: Improper Handling of URL Encoding (Hex Encoding) - The product does not properly handle when all or part of an input has been URL encoded.

> RED HAT SECURITY ADVISORIES

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
An update for Red Hat Hardened Images RPMs is now available.
Red Hat Security Advisory: A Subscription Management tool for finding and reporting Red Hat product usage
A Subscription Management tool for finding and reporting Red Hat product usage
Red Hat Security Advisory: Ansible plug-ins for Red Hat Developer Hub Product Release Update
Updated images are now available for Red Hat Ansible Automation Platform 2.2, which include new features, bug fixes, and enhancements for Red Hat Ansible Automation Platform integration with Red Hat D...
Red Hat Security Advisory: Ansible plug-ins for Red Hat Developer Hub Product Release Update
Updated images are now available for Red Hat Ansible Automation Platform 2.1, which include new features, bug fixes, and enhancements for Red Hat Ansible Automation Platform integration with Red Hat D...
Red Hat Security Advisory: Red Hat Developer Hub 1.9.9 release.
Red Hat Developer Hub 1.9.9 has been released.
Red Hat Security Advisory: OpenShift Container Platform 4.22.15 security and extras update
Red Hat OpenShift Container Platform release 4.22.15 is now available with updates to packages and images that fix several bugs. This release includes a security update for Red Hat OpenShift Containe...
Red Hat Security Advisory: OpenShift Container Platform 4.21.34 security and extras update
Red Hat OpenShift Container Platform release 4.21.34 is now available with updates to packages and images that fix several bugs. This release includes a security update for Red Hat OpenShift Containe...
Red Hat Security Advisory: Network Observability 1.12.3 for OpenShift
Network Observability 1.12 for Red Hat OpenShift.
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update
An update is now available for Red Hat Ansible Automation Platform 2.6
Red Hat Security Advisory: cockpit-image-builder security update
An update for cockpit-image-builder is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability S...
Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.16.6 security update
Red Hat Advanced Cluster Management for Kubernetes v2.16 general availability release images, which provide security fixes, bug fixes, and updated container images. Red Hat Product Security has rated...
Red Hat Security Advisory: multicluster engine for Kubernetes v2.17.3 security update
Red Hat multicluster engine for Kubernetes v2.17 general availability release images, which provide security fixes, bug fixes, and updated container images. Red Hat Product Security has rated this up...
Red Hat Security Advisory: multicluster engine for Kubernetes v2.11.7 security update
Red Hat multicluster engine for Kubernetes v2.11 general availability release images, which provide security fixes, bug fixes, and updated container images. Red Hat Product Security has rated this up...
Red Hat Security Advisory: Cluster Observability Operator 1.5.3
The Cluster Observability Operator (COO) is a Red Hat OpenShift Container Platform Operator that you can deploy to manage observability component stacks by using custom resource descriptions (CRDs).
Red Hat Security Advisory: Red Hat Developer Hub 1.10.5 Plugin Catalog GA plugins release.
Red Hat Developer Hub 1.10.5 Plugin Catalog GA plugins release.
Red Hat Security Advisory: Red Hat Developer Hub 1.10.5 release.
Red Hat Developer Hub 1.10.5 has been released.
Red Hat Security Advisory: Ansible automation portal Red Hat Enterprise Linux Images
Updated images are now available for Red Hat Ansible Automation Platform 2.2, which include new features, bug fixes, and enhancements for the Red Hat Ansible Automation Portal bootable container image...
Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: RHOAI 2.25.12 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: RHOAI 3.5.2 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: RHOAI 3.4.6 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.

> RED HAT SEVERITY ASSESSMENT

THREAT SEVERITY
Important

> GITHUB SECURITY ADVISORY

GHSA-jqff-g426-hqxp HIGH

fast-uri vulnerable to host confusion via percent-encoded scheme normalization

AFFECTED PACKAGES:
NPM / fast-uri
>= 4.0.0, < 4.1.3
Fixed in: 4.1.3
NPM / fast-uri
>= 3.0.0, < 3.1.6
Fixed in: 3.1.6
NPM / fast-uri
>= 2.3.1, < 2.4.5
Fixed in: 2.4.5

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

fast-uri vulnerable to host confusion via percent-encoded scheme normalization

AFFECTED PACKAGES:
Unknown / Unknown
24 versions affected
ALIASES:
GHSA-jqff-g426-hqxp

> HISTORIQUE DES MODIFICATIONS

Première apparition
24/08/2026 11:16
Source: NVD
📊 ENRICHISSEMENT 01/09/2026 06:02
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-177: Improper Handling of URL Encoding (Hex Encoding) - The product does not properly handle when all or part of an input has been URL encoded.
📊 ENRICHISSEMENT 30/08/2026 05:01
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
N/A
Nouvelle valeur:
{ "threat_severity": "Important", "severity_scale": null }
📊 ENRICHISSEMENT 30/08/2026 05:01
REDHAT
Champ modifié: Red Hat
Ancienne valeur:
Non
Nouvelle valeur:
Oui
Total des modifications: 3 Dernière mise à jour: 1 month ago

> REFERENCES

https://cna.openjsf.org/security-advisories.html
https://github.com/fastify/fast-uri/security/advisories/GHSA-jqff-g426-hqxp
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