CVE-2026-42965 Openshift/router: openshift/router: cloud metadata ssrf via fqdn-typed endpointslice bypasses destination validation

High 7.7 Published 29 May 2026 Updated 1 Oct 2026

An attacker with EndpointSlice write access can bypass destination validation to access cloud metadata, disclosing sensitive instance credentials.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-42965?

CVE-2026-42965 is a high-severity server-side request forgery vulnerability in Redhat Openshift Container Platform, published on 29 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-918

Which versions are affected by CVE-2026-42965?

It affects 2 products.

Products include Redhat Openshift Container Platform, Redhat Openshift Router.

How do I fix CVE-2026-42965?

No fix has been published for CVE-2026-42965 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-42965 being exploited?

There is no known exploitation of CVE-2026-42965 in the wild and no public exploit code.

All Redhat Openshift Container Platform vulnerabilities

Sources

Also known as GHSA-76ww-43j5-78x5.