{"id":"CVE-2026-44283","aliases":["BIT-etcd-2026-44283","GHSA-x35m-3gp4-4fh5","GO-2026-5736"],"url":"https://o3.security/vulnerability/CVE-2026-44283","summary":"etcd: Read access via PrevKv in etcd transactions may bypass RBAC authorization checks","details":"### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nA vulnerability in etcd allows read access via PrevKv, or lease attachment in Put requests within transaction operations, to bypass RBAC authorization checks. An authenticated user without sufficient read or lease-related permissions may be able to access unauthorized data or attach leases by invoking transaction operations with these features enabled.\n\nKubernetes does not rely on etcd’s built-in authentication and authorization. Instead, the API server handles authentication and authorization itself, so typical Kubernetes deployments are not affected.\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nThis vulnerability is patched in the following versions:\n- etcd 3.6.11\n- etcd 3.5.30\n- etcd 3.4.44\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nIf upgrading is not immediately possible, reduce exposure by treating the affected\nRPCs as unauthenticated in practice.\n\n- restrict network access to etcd server ports so only trusted components can connect\n- require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate\ndistribution\n\n### Reporters\n\nSamy Ghannad (@SamyGhannad on Github) reported that read access via PrevKv in a Put request within etcd transactions bypassed RBAC authorization checks. Benjamin Wang (@ahrtr ) further analyzed that lease attachment in a Put request within etcd transactions also bypassed RBAC authorization checks","published":"2026-05-14T17:01:33.598Z","modified":"2026-08-27T18:26:15.113771909Z","cvss":{"score":0,"severity":"NONE","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N"},"epss":{"score":0.00225,"percentile":0.12908,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"go.etcd.io/etcd/v3","fixedVersion":"3.6.11"},{"ecosystem":"Go","name":"go.etcd.io/etcd/v3","fixedVersion":"3.5.30"},{"ecosystem":"Go","name":"go.etcd.io/etcd","fixedVersion":"3.4.44"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44283.json"},{"type":"ADVISORY","url":"https://github.com/etcd-io/etcd/security/advisories/GHSA-x35m-3gp4-4fh5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44283"},{"type":"PACKAGE","url":"https://github.com/etcd-io/etcd"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T18:26:15.113771909Z"}}