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PUBLISHED

2026-05-08 16:16

MODIFIED

2026-05-08 16:16

CVSS_SCORE V3

8.6

EPSS (Prob. Exploit)

0.31%

Top 76.0%

DATA SOURCES:

NVD 🔗 2026-05-08 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-11-08 GITHUB 🔗 2026-10-29 OSV 🔗 2026-11-02

> DESCRIPTION

18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Versions prior to 3.9.3 allow an unauthenticated HTTP client to pollute Object.prototype in the Node.js process hosting the middleware, via two unvalidated entry points that reach internal object-key writes: getResourcesHandler and missingKeyHandler. This can break authorisation checks (if (user.isAdmin) returning true for any user), cause type-confusion DoS, and depending on downstream code it can be chained into RCE.

> 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:L/I:H/A:L

EXPLOITABILITY

3.9

IMPACT

4.7

> MÉTRIQUES CVSS DÉTAILLÉES

                CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
            

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	Low (L)	Divulgation limitée d'informations
I (Impact Intégrité) Integrity Impact	High (H)	Modification totale des données possible
A (Impact Disponibilité) Availability Impact	Low (L)	Interruption partielle du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité

Low

Divulgation limitée d'informations

Intégrité

High

Modification totale des données possible

Disponibilité

Low

Interruption partielle du service possible

> WEAKNESSES

CWE-22 CWE-1321

> CWE DETAILED DESCRIPTIONS

CWE-22: Improper Limitation of a Pathname to a Restricted Directory - The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. | CWE-1321: Improperly Controlled Modification of Object Prototype Attributes - The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

> GITHUB SECURITY ADVISORY

GHSA-5fgg-jcpf-8jjw HIGH

i18next-http-middleware: Prototype pollution and path traversal via user-controlled language and namespace parameters

AFFECTED PACKAGES:

NPM / i18next-http-middleware

< 3.9.3

Fixed in: 3.9.3

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Prototype pollution and path traversal in i18next-http-middleware via user-controlled language and namespace parameters

AFFECTED PACKAGES:

Unknown / Unknown

53 versions affected

ALIASES:

GHSA-5fgg-jcpf-8jjw

> HISTORIQUE DES MODIFICATIONS

Première apparition

08/05/2026 16:16

Source: NVD

📊 ENRICHISSEMENT 01/11/2026 06:59

CWE

Champ modifié: Description CWE

Ancienne valeur:

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') - The product uses external input to construct a pathname that is intended to identify a file or directory that i...

Nouvelle valeur:

📊 ENRICHISSEMENT 01/06/2026 06:01

CWE