{"answers":{"affected":"3 open source packages ship an affected version, including open-cluster-management.io/ocm. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-4740 in the wild and no public exploit code.","fix":"Upgrade open-cluster-management.io/ocm to 1.2.1 or later.","what":"CVE-2026-4740 is a high-severity vulnerability in Red Hat Multicluster Engine for Kubernetes, published on 7 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-4740 and fix it if it is affected.\n\nWhat it is: CVE-2026-4740 is a high-severity vulnerability in Red Hat Multicluster Engine for Kubernetes, published on 7 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-4740 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- open-cluster-management.io/ocm (Go): affected all versions; fixed in 1.2.1\n- open-cluster-management.io/ocm (Go): affected all versions; fixed in 1.2.1\n- open-cluster-management.io/ocm (Go): affected all versions; fixed in 1.2.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-4740/ (Markdown: https://insights.sbomify.com/CVE-2026-4740/index.md)","id":"CVE-2026-4740","markdown":"https://insights.sbomify.com/CVE-2026-4740/index.md","name":"CVE-2026-4740","record":{"aliases":["GHSA-q4gv-pjmh-c735","GO-2026-5564"],"analysis":{"component_type":"cloud_service","fix_type":"patch","impacts":["privilege_escalation","code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Kubernetes cluster management","requires_auth":"high_privilege","summary":"A managed cluster administrator can forge client certificates to escalate privileges and control other managed clusters, including the hub cluster.","user_interaction":"not_required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"advanced_cluster_management_for_kubernetes","vendor":"redhat"}],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"description":"A flaw was found in Open Cluster Management (OCM), the technology underlying Red Hat Advanced Cluster Management (ACM). Improper validation of Kubernetes client certificate renewal allows a managed cluster administrator to forge a client certificate that can be approved by the OCM controller. This enables cross-cluster privilege escalation and may allow an attacker to gain control over other managed clusters, including the hub cluster.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Open Cluster Management (OCM): Cross-cluster privilege escalation via improper Kubernetes client certificate renewal validation","id":"CVE-2026-4740","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"privilege_escalation","year":"2026"},"n_packages":3,"n_references":8,"next":{"headline":"Path Traversal Vulnerability in TeamJCD/JoyConDroid","id":"CVE-2026-4741"},"packages":[{"ecosystem":"Go","fixed":["1.2.1"],"introduced":["0"],"last_affected":[],"package":"open-cluster-management.io/ocm","purl":null,"source":"GHSA-q4gv-pjmh-c735"},{"ecosystem":"Go","fixed":["1.2.1"],"introduced":["0"],"last_affected":[],"package":"open-cluster-management.io/ocm","purl":"pkg:golang/open-cluster-management.io/ocm","source":"GHSA-q4gv-pjmh-c735"},{"ecosystem":"Go","fixed":["1.2.1"],"introduced":["0"],"last_affected":[],"package":"open-cluster-management.io/ocm","purl":"pkg:golang/open-cluster-management.io/ocm","source":"GO-2026-5564"}],"prev":{"headline":"Integer overflow vulnerabilities in InsightSoftwareConsortium/ITK","id":"CVE-2026-4739"},"products":["Multicluster Engine for Kubernetes","multicluster engine for Kubernetes 2.1","multicluster engine for Kubernetes 2.11","multicluster engine for Kubernetes 2.6","multicluster engine for Kubernetes 2.8","multicluster engine for Kubernetes 2.9"],"published":"2026-04-07","related":[{"cvss_score":7.8,"headline":"Privilege escalation in RHACM","id":"CVE-2023-3027","kev_date_added":null,"published":"2023-06-05"},{"cvss_score":7.8,"headline":"Server-side request forgery in RHACM","id":"CVE-2022-3841","kev_date_added":null,"published":"2023-01-11"},{"cvss_score":7.1,"headline":"Insights-client-rhel9: insights-client: pull-secret bearer token written to logs on non-200 ccx response","id":"CVE-2026-71474","kev_date_added":null,"published":"2026-08-11"},{"cvss_score":6.8,"headline":"Insights-client-rhel9: insights-client: spoke-controlled clusterid injected unencoded into insights api url path","id":"CVE-2026-71475","kev_date_added":null,"published":"2026-08-11"},{"cvss_score":6.5,"headline":"Insights-client: insights-client: clusterrole grants cluster-wide secrets get/list/watch beyond least privilege","id":"CVE-2026-71846","kev_date_added":null,"published":"2026-08-12"},{"cvss_score":6.5,"headline":"SQL injection in Red Hat Advanced Cluster Management for Kubernetes","id":"CVE-2022-2238","kev_date_added":null,"published":"2022-09-01"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-09","vendors":["Red Hat"]},"summary":"A managed cluster administrator can forge client certificates to escalate privileges and control other managed clusters, including the hub cluster.","url":"https://insights.sbomify.com/CVE-2026-4740/"}