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CVE-2026-55774— OpenBao: Cross-namespace lease revocation/renewal via canonical sys/leases/{revoke,renew} — incomplete fix of CVE-2026-45808

Quick assessment

Affected
openbao openbao
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenBao 是一个基于身份的开源密钥管理系统。在 2.5.5 版本之前，拥有某个命名空间中 路径访问权限的 OpenBao 用户，在已知其他命名空间中租约 ID 的情况下，可以撤销该其他命名空间中的租约，从而绕过命名空间访问控制列表（ACL）隔离。受影响的租约查找路由逻辑（位于 文件中）使得 和 函数能够解析请求命名空间之外缓存或存储的租约数据，导致一个租户若故意泄露其租约标识符，其租约及底层凭证可能被另一个租户撤销。该问题已在 2.5.5 版本中修复。

CVSS 2.1 · Low

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-55774

Vulnerability Information
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Vulnerability Title
OpenBao: Cross-namespace lease revocation/renewal via canonical sys/leases/{revoke,renew} — incomplete fix of CVE-2026-45808
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
openbao openbao < 2.5.5 -

II. Public POCs for CVE-2026-55774

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III. Intelligence Information for CVE-2026-55774

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Patches & Fixes for CVE-2026-55774 (4)

Vendor Advisories for CVE-2026-55774 (1)

Vendor Pages for CVE-2026-55774 (2)

Same Patch Batch · openbao · 2026-09-15 · 4 CVEs total

CVE-2026-55770 6.8 MEDIUM OpenBao: LDAPi ldaputil (wrong escape func)
CVE-2026-55776 6.5 MEDIUM OpenBao: Transit secrets engine crashes on key creation with `derived: true` for asymmetri
CVE-2026-55775 2.3 LOW OpenBao's System Backend allows Unauthorized Management of the containing Namespace

IV. Related Vulnerabilities

Same product: openbao
Same vendor: openbao
Same weakness: CWE-863

V. Comments for CVE-2026-55774

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