Bug 2533975 (CVE-2026-55775)

Summary: CVE-2026-55775 github.com/openbao/openbao: OpenBao: Unauthorized management of containing namespaces via path canonicalization flaw
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in OpenBao, an identity-based secrets management system. An authenticated user with specific permissions on /sys/namespaces/root within a non-root namespace could exploit a vulnerability in the namespace path canonicalization process. This flaw allows the user to perform unauthorized operations, such as looking up, deleting, locking, or modifying custom metadata, on the containing namespace itself. The root namespace and other unrelated namespaces are not affected.
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Description OSIDB Bzimport 2026-09-15 15:58:20 UTC 
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.