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CVE-2026-55775— OpenBao's System Backend allows Unauthorized Management of the containing Namespace

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 路径权限（capabilities）的 OpenBao 用户，若在非根命名空间（non-root namespace）中，可利用命名空间规范化（canonicalization）过程中对字面量 root 路径的特殊处理机制进行利用。 端点家族可以通过路径前缀或 请求头解析其所属的命名空间。由于 ACL（访问控制列表）检查发生在将 规范化为空路径之前，导致 会解析到系统后端所属的包含命名空间（containing namespace）。

CVSS 2.3 · Low
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I. Basic Information for CVE-2026-55775

Vulnerability Information
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Vulnerability Title
OpenBao's System Backend allows Unauthorized Management of the containing Namespace
Source: CVE Program / CVE List V5
Vulnerability Description
OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, OpenBao users granted capabilities on /sys/namespaces/root within a non-root namespace could exploit special handling of the literal root path in namespace canonicalization. The /sys/namespaces/* endpoint family can resolve its containing namespace through a path prefix or X-Vault-Namespace header. ACL checks occurred before root canonicalized to an empty path, causing /sys/namespaces/root to resolve to the system backend's containing namespace and allowing permitted lookups, deletion, locking, or custom metadata changes against that direct containing namespace. The root namespace and arbitrary unrelated namespaces are not affected, and available operations depend on the capabilities granted on the path and subpaths such as /api-lock. 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:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
openbao openbao < 2.5.5 -

II. Public POCs for CVE-2026-55775

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III. Intelligence Information for CVE-2026-55775

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Patches & Fixes for CVE-2026-55775 (3)

Vendor Pages for CVE-2026-55775 (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-2026-55774 2.1 LOW OpenBao: Cross-namespace lease revocation/renewal via canonical sys/leases/{revoke,renew}

IV. Related Vulnerabilities

Same product: openbao
Same vendor: openbao
Same weakness: CWE-285

V. Comments for CVE-2026-55775

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