7.7
High
CVE-2026-42965 Openshift/router: openshift/router: cloud metadata ssrf via fqdn-typed endpointslice bypasses destination validation
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.
CVSS 3.1 detail
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:NExploitable remotely over the network, with an ordinary account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- Interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat OpenShift Container Platform 4 | Versions not published | |
| Red Hat OpenShift Container Platform 5 | Versions not published | |
| Red Hat OpenShift Container Platform 4.19 1786771399 | earliest → < 1786771399 | 1786771399 |
| Red Hat OpenShift Container Platform 4.20 1786496552 | earliest → < 1786496552 | 1786496552 |
| Red Hat OpenShift Container Platform 4.21 1786498169 | earliest → < 1786498169 | 1786498169 |
| Red Hat OpenShift Container Platform 4.22 1786584196 | earliest → < 1786584196 | 1786584196 |
| Red Hat OpenShift Container Platform 4.2 1786496552 | earliest → < 1786496552 | 1786496552 |
| Red Hat OpenShift Container Platform 4.18 1788578875 | earliest → < 1788578875 | 1788578875 |
| Red Hat OpenShift Container Platform 4.17 1789938693 | earliest → < 1789938693 | 1789938693 |
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