CVE-2026-55774

Description

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.

References

• https://github.com/openbao/openbao/commit/9ba1413d793223cca67db12434093a2f25fdc540
• https://github.com/openbao/openbao/commit/b20b999dd4044d7b419a5472d8fe08407828be37
• https://github.com/openbao/openbao/pull/3307
• https://github.com/openbao/openbao/pull/3310
• https://github.com/openbao/openbao/releases/tag/v2.5.5