{"id":"CVE-2026-42965","title":"A flaw was found in the OpenShift Router","summary":"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 endpoin…","severity":"high","cvss":7.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","cwe":["CWE-918"],"vendor":"redhat","product":"openshift_container_platform","affected":["openshift_container_platform = 4.0","openshift_router"],"patched":["openshift_container_platform 4.19","openshift_container_platform 4.21","openshift_container_platform 4.22","openshift_container_platform 4.2"],"published":"2026-05-29","updated":"2026-09-21","sourceUpdated":"2026-09-21T12:17:13.497","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-42965","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:54583","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:54602","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:54770","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:57408","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:65852","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-42965","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2483184","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:54583","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:54602","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:54770","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:57408","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-42965","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2483184","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42965.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-42965"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42965"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00263,"epssPercentile":0.18401,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-05-30T02:24:09.743182Z"},"ingestedAt":"2026-08-23T11:46:47.892Z","slug":"CVE-2026-42965","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `openshift_container_platform = 4.0`\n- `openshift_router`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:57408** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:57408)\n- **RHSA-2026:54602** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.21 · released 2026-08-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:54602)\n- **RHSA-2026:54770** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-08-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:54770)\n- **RHSA-2026:54583** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.2 · released 2026-08-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:54583)\n- **Red Hat VEX** · Important · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42965.json)","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":42.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}