{"id":"CVE-2026-55774","aliases":["BIT-openbao-2026-55774","GHSA-c36x-h252-g9x2","GO-2026-5304"],"url":"https://o3.security/vulnerability/CVE-2026-55774","summary":"OpenBao: Cross-namespace lease revocation/renewal via canonical sys/leases/{revoke,renew} — incomplete fix of CVE-2026-45808","details":"### Summary\n\nOpenBao users with access to the `sys/leases/revoke/:lease_id` endpoint in any namespace can revoke leases in any other namespace as long as the lease identifier is known to them, bypassing ACLs that should apply for cross-namespace revocations.\n\n### Impact\n\nOpenBao's namespaces provide multi-tenant separation. A tenant who intentionally leaks lease identifiers can have their lease and underlying credential revoked by a user in another tenant.\n\n### Patch\n\nThis will be fixed in OpenBao v2.5.5.\n\n### References\n\nThis vulnerability is similar to but distinct from:\n\n- CVE-2026-45808 / GHSA-v8v8-cm84-m686\n- CVE-2026-40264 / GHSA-p49j-v9wc-wg57","published":"2026-09-15T15:42:03.157Z","modified":"2026-10-28T02:31:05.599339791Z","cvss":null,"epss":{"score":0.00444,"percentile":0.37802,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/openbao/openbao","fixedVersion":null},{"ecosystem":"Go","name":"github.com/openbao/openbao","fixedVersion":"0.0.0-20260617103932-b20b999dd404"}],"fix":{"url":"https://github.com/openbao/openbao/commit/9ba1413d793223cca67db12434093a2f25fdc540","label":"openbao/openbao@9ba1413"},"references":[{"type":"WEB","url":"https://github.com/openbao/openbao/releases/tag/v2.5.5"},{"type":"WEB","url":"https://github.com/openbao/openbao/releases/tag/v2.6.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55774.json"},{"type":"ADVISORY","url":"https://github.com/openbao/openbao/security/advisories/GHSA-c36x-h252-g9x2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55774"},{"type":"FIX","url":"https://github.com/openbao/openbao/commit/9ba1413d793223cca67db12434093a2f25fdc540"},{"type":"FIX","url":"https://github.com/openbao/openbao/commit/b20b999dd4044d7b419a5472d8fe08407828be37"},{"type":"FIX","url":"https://github.com/openbao/openbao/pull/3307"},{"type":"FIX","url":"https://github.com/openbao/openbao/pull/3310"},{"type":"PACKAGE","url":"https://github.com/openbao/openbao"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:31:05.599339791Z"}}