> CVE-2026-41174 [MEDIUM]

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PUBLISHED
2026-04-30 21:16
MODIFIED
2026-04-30 21:16
CVSS_SCORE V3
4.8
EPSS (Prob. Exploit)
0.27%
Top 81.0%
DATA SOURCES:
NVD đź”— 2026-04-30 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-10-25 GITHUB đź”— 2026-11-05 OSV đź”— 2026-09-20

> DESCRIPTION

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik's Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects direct cross-namespace middleware references from IngressRoute objects, but fails to apply the same restriction to middleware references nested inside a Chain middleware's spec.chain.middlewares[]. An actor with permission to create or update Traefik CRDs in their own namespace can exploit this to cause Traefik to resolve and apply middleware objects from another namespace, bypassing the documented isolation boundary. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

> AFFECTED_PRODUCTS

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

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Local (L)
Exploit nécessite un accès local au système
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
Low (L)
Authentifié avec compte utilisateur basique
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
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-653 CWE-863

> CWE DETAILED DESCRIPTIONS

CWE-653: Improper Isolation or Compartmentalization - The product does not properly compartmentalize or isolate functionality, processes, or resources that require different privilege levels, rights, or permissions. | CWE-863: Incorrect Authorization - The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

> GITHUB SECURITY ADVISORY

GHSA-xhjw-95fp-8vgq MODERATE

Traefik Kubernetes CRD allows unauthorized cross-namespace middleware binding

AFFECTED PACKAGES:
GO / github.com/traefik/traefik
<= 1.7.34
GO / github.com/traefik/traefik/v2
< 2.11.43
Fixed in: 2.11.43
GO / github.com/traefik/traefik/v3
>= 3.0.0-beta1, < 3.6.14
Fixed in: 3.6.14
GO / github.com/traefik/traefik/v3
>= 3.7.0-ea.1, < 3.7.0-rc.2
Fixed in: 3.7.0-rc.2

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Traefik Kubernetes CRD allows unauthorized cross-namespace middleware binding

AFFECTED PACKAGES:
Unknown / Unknown
290 versions affected
ALIASES:
GHSA-xhjw-95fp-8vgq, GO-2026-5760

> HISTORIQUE DES MODIFICATIONS

Première apparition
30/04/2026 21:16
Source: NVD
📊 ENRICHISSEMENT 01/05/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-653: Improper Isolation or Compartmentalization - The product does not properly compartmentalize or isolate functionality, processes, or resources that require different privilege levels, rights, ...
Total des modifications: 1 Dernière mise à jour: 6 months ago

> REFERENCES

https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e5541...
https://github.com/traefik/traefik/releases/tag/v2.11.43
https://github.com/traefik/traefik/releases/tag/v3.6.14
https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq
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