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TI-2026-40264 Aliases CVE-2026-55775GHSA-mwr2-wmgp-crj6

OpenBao's System Backend allows Unauthorized Management of the containing Namespace

Priority LOW 13CWE-285Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-285.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00484 41st percentileScored 2026-11-07
Fix Fixed openbao (openbao): 2.5.5github.com/openbao/openbao (Go): 0.0.0-20260617103935-d3c1cc64b1ae

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
openbaoopenbaobefore 2.5.52.5.5Patch availableCNA
—github.com/openbao/openbao (Go)before 0.0.0-20260617103935-d3c1cc64b1ae0.0.0-20260617103935-d3c1cc64b1aePatch availableGHSA-mwr2-wmgp-crj6
—github.com/openbao/openbao (Go)0.1.0 – 2.5.4—No fix listedGHSA-mwr2-wmgp-crj6
  • openbao Vendoropenbao Affected before 2.5.5 Fixed in 2.5.5 Patch available CNA
  • github.com/openbao/openbao (Go) Vendor— Affected before 0.0.0-20260617103935-d3c1cc64b1ae Fixed in 0.0.0-20260617103935-d3c1cc64b1ae Patch available GHSA-mwr2-wmgp-crj6
  • github.com/openbao/openbao (Go) Vendor— Affected 0.1.0 – 2.5.4 Fixed in — No fix listed GHSA-mwr2-wmgp-crj6

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:openbao:openbao:*:*:*:*:*:*:*:*——openbao
  • cpe:2.3:a:openbao:openbao:*:*:*:*:*:*:*:* Versions — — ·openbao

Remediation

  • Fix · CNA openbao (openbao) Fixed in 2.5.5
  • Fix · GHSA-mwr2-wmgp-crj6 github.com/openbao/openbao (Go) Fixed in 0.0.0-20260617103935-d3c1cc64b1ae Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55775
  2. 2026-10-03 Alias added: GHSA-mwr2-wmgp-crj6

References

Other 8

  • TI-2024-01904 Vault Cert Auth Method Did Not Correctly Validate Non-CA Certificates CVSS 3.1CRITICAL 9.8
  • TI-2026-34075 OpenBao's Inline Auth Incorrectly Redacted Headers CVSS 4.0MEDIUM 5.4
  • TI-2026-40259 OpenBao: LDAPi ldaputil (wrong escape func) CVSS 3.1MEDIUM 6.8
  • TI-2026-40265 OpenBao: Transit secrets engine crashes on key creation with `derived: true` for asymmetric key types CVSS 3.1MEDIUM 6.5
  • TI-2026-28381 OpenBao has Decompression Bomb via Unbounded Copy in OCI Plugin Extraction (DoS) CVSS 3.1MEDIUM 6.5
  • TI-2026-45068 OpenBao's Recovery Mode Vulnerable To Token Leakage via Timing Attack CVSS 4.0CRITICAL 9.2
See all 48 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences