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Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M

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

Low 2.3

In plain English

A low-severity security flaw in openbao from openbao. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)2.3Low
Exploit odds (30 days)0.5%top 58.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/openbao/openbao0.0.0-20260617103935-d3c1cc64b1aeGHSA-mwr2-wmgp-crj6
Gogithub.com/openbao/openbaono fix listedGHSA-mwr2-wmgp-crj6
Gogithub.com/openbao/openbao0.0.0-20260617103935-d3c1cc64b1aeGO-2026-5517

Affected products (as reported)

VendorProductVersions
openbao openbao < 2.5.5

Weakness: CWE-285 · Vector: 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

References