要点
- CVE-2026-55774 は github.com/openbao/openbao に影響する深刻度「低」 (CVSS 2.1) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.56%（全脆弱性の 46.7% より高い）。
- 対処：0.0.0-20260617103932-b20b999dd404 以降に更新してください。
| パッケージ | 影響を受けるバージョン | 修正済みバージョン |
|---|
| github.com/openbao/openbao Go | ≥ 0.1.0, ≤ 2.5.4≥ 0.1.0< 0.0.0-20260617103932-b20b999dd404
| 0.0.0-20260617103932-b20b999dd404
|
概要
Summary
OpenBao 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.
Impact
OpenBao'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.
Patch
This will be fixed in OpenBao v2.5.5.
References
This vulnerability is similar to but distinct from:
- CVE-2026-45808 / GHSA-v8v8-cm84-m686
- CVE-2026-40264 / GHSA-p49j-v9wc-wg57
NVD の説明
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.
github.com/openbao/openbao のその他の脆弱性
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