CVE-2026-41174

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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."}, {"lang": "es", "value": "Traefik es un proxy inverso HTTP y un equilibrador de carga. Antes de las versiones 2.11.43, 3.6.14 y 3.7.0-rc.2, existe una potencial vulnerabilidad en la aplicaci\u00f3n del aislamiento entre espacios de nombres del proveedor CRD de Kubernetes de Traefik. Cuando providers.kubernetesCRD.allowCrossNamespace=false, Traefik rechaza correctamente las referencias directas de middleware entre espacios de nombres de los objetos IngressRoute, pero no aplica la misma restricci\u00f3n a las referencias de middleware anidadas dentro de spec.chain.middlewares[] de un middleware Chain. Un actor con permiso para crear o actualizar CRD de Traefik en su propio espacio de nombres puede exploit esto para hacer que Traefik resuelva y aplique objetos middleware de otro espacio de nombres, eludiendo el l\u00edmite de aislamiento documentado. Este problema ha sido parcheado en las versiones 2.11.43, 3.6.14 y 3.7.0-rc.2."}], "id": "CVE-2026-41174", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-41174", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-04T13:25:25.541487Z", "version": "2.0.3"}}]}, "published": "2026-04-30T21:16:33.240", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/traefik/traefik/releases/tag/v2.11.43"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/traefik/traefik/releases/tag/v3.6.14"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Patch", "Vendor Advisory"], "url": "https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-653"}, {"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "Traefik: github.com/traefik/traefik: Traefik: Cross-namespace isolation bypass via nested middleware references", "id": "2464226", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464226"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.2", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-551", "details": ["A flaw was found in Traefik, an HTTP reverse proxy and load balancer. When the Kubernetes Custom Resource Definition (CRD) provider's allowCrossNamespace setting is false, Traefik incorrectly processes nested middleware references. An attacker with permissions to create or update Traefik CRDs in their own namespace can exploit this to bypass the intended cross-namespace isolation, allowing Traefik to apply middleware objects from other namespaces. This could lead to unauthorized access or manipulation of resources across namespaces."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-41174", "package_state": [{"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Fix deferred", "package_name": "devspaces/traefik-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}], "public_date": "2026-04-30T20:20:29Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-41174\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-41174\nhttps://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d\nhttps://github.com/traefik/traefik/releases/tag/v2.11.43\nhttps://github.com/traefik/traefik/releases/tag/v3.6.14\nhttps://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2\nhttps://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq"], "threat_severity": "Moderate"}

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