CVE-2026-42965

A flaw was found in the OpenShift Router. A user with EndpointSlice write access can exploit this vulnerability by creating a Service backed by an FQDN (Fully Qualified Domain Name) EndpointSlice that resolves to a cloud metadata endpoint. This allows the router to proxy requests to the cloud metadata endpoint, leading to the disclosure of instance credentials and other sensitive metadata. This bypasses previous security measures for validating IP addresses.

CVSS v3 7.7 HIGH

7.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.1 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:54583
https://access.redhat.com/errata/RHSA-2026:54602
https://access.redhat.com/errata/RHSA-2026:54770
https://access.redhat.com/errata/RHSA-2026:57408
https://access.redhat.com/errata/RHSA-2026:65852
https://access.redhat.com/errata/RHSA-2026:70587
https://access.redhat.com/security/cve/CVE-2026-42965	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2483184	Issue Tracking Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:54583
https://access.redhat.com/errata/RHSA-2026:54602
https://access.redhat.com/errata/RHSA-2026:54770
https://access.redhat.com/errata/RHSA-2026:57408
https://access.redhat.com/security/cve/CVE-2026-42965	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2483184	Issue Tracking Vendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42965.json

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:redhat:openshift_container_platform:4.0:::::::*
	cpe:2.3:a:redhat:openshift_router:-:::::::*

History

01 Oct 2026, 17:17

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:70587 -

21 Sep 2026, 12:17

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:65852 -

Information

Published : 2026-05-29 11:16

Updated : 2026-10-01 17:17

NVD link : CVE-2026-42965

Mitre link : CVE-2026-42965

CVE.ORG link : CVE-2026-42965

JSON object : View

Products Affected

redhat

openshift_container_platform
openshift_router

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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A user with EndpointSlice write access can exploit this vulnerability by creating a Service backed by an FQDN (Fully Qualified Domain Name) EndpointSlice that resolves to a cloud metadata endpoint. This allows the router to proxy requests to the cloud metadata endpoint, leading to the disclosure of instance credentials and other sensitive metadata. This bypasses previous security measures for validating IP addresses."}, {"lang": "es", "value": "Se encontr\u00f3 un fallo en el router de OpenShift. Un usuario con acceso de escritura a EndpointSlice puede explotar esta vulnerabilidad creando un Servicio respaldado por un EndpointSlice FQDN (Fully Qualified Domain Name) que se resuelve a un endpoint de metadatos en la nube. Esto permite al router redirigir solicitudes al endpoint de metadatos en la nube, lo que lleva a la divulgaci\u00f3n de credenciales de instancia y otros metadatos sensibles. Esto elude las medidas de seguridad anteriores para la validaci\u00f3n de direcciones IP."}], "lastModified": "2026-10-01T17:17:24.823", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "932D137F-528B-4526-9A89-CD59FA1AB0FE"}, {"criteria": "cpe:2.3:a:redhat:openshift_router:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EB6C1612-6A17-4F3B-B170-7C9F6028FBBB"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}