CVE-2026-55774: Openbao

Low severity, CVSS 2.1. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Openbao Openbao: before 2.5.5 (fixed in 2.5.5)

Published 2026-09-15. Last modified 2026-09-25.