CVE-2026-42965
published 2026-05-29CVE-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…
PriorityP340medium6.5CVSS 3.1
AVNACLPRLUINSUCHINAN
EPSS
0.23%
13.4th percentile
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.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| openshift4 | ose-haproxy-router | — | — |
| openshift4 | ose-haproxy-router-rhel9 | — | — |
| redhat | openshift_container_platform | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
vendor_redhat7.7HIGH
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Red Hat
openshift/router: openshift/router: cloud metadata SSRF via FQDN-typed EndpointSlice bypasses destination validation
vendor_redhat·2026-04-17·CVSS 7.7
CVE-2026-42965 [HIGH] CWE-918 openshift/router: openshift/router: cloud metadata SSRF via FQDN-typed EndpointSlice bypasses destination validation
openshift/router: openshift/router: cloud metadata SSRF via FQDN-typed EndpointSlice bypasses destination validation
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.
Package: openshift4/ose-haproxy-router (Red Hat OpenShift Container Platform 4) - Affected
Package: openshift4/ose-haproxy-router-rhel9 (Red Hat OpenShift Container Platform 4) - Affected
GHSA
GHSA-76ww-43j5-78x5: A flaw was found in the OpenShift Router
ghsa_unreviewed·2026-05-29
CVE-2026-42965 [HIGH] CWE-918 GHSA-76ww-43j5-78x5: A flaw was found in the OpenShift Router
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.
No detection rules found.
No public exploits indexed.
2026-05-29
Published