{"id":"CVE-2026-55774","aliases":["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":"OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, an OpenBao user with access to sys/leases/revoke/:lease_id in one namespace could revoke a lease in another namespace when the foreign lease_id was known, bypassing namespace ACL isolation. The affected lease lookup routing in vault/expiration.go allowed FetchLeaseInfo and loadEntry to resolve cached or stored lease data outside the request namespace, allowing a tenant that intentionally disclosed a lease identifier to have the lease and its underlying credential revoked by another tenant. This issue is fixed in version 2.5.5.","published":"2026-09-15T15:42:03.157Z","modified":"2026-09-16T03:47:03.724031979Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"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":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55774.json"},{"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":"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/openbao/openbao/security/advisories/GHSA-c36x-h252-g9x2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55774"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-16T03:47:03.724031979Z"}}