Improper Restriction of Security Token Assignment Affecting openbao package, versions <2.5.3-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-CHAINGUARDLATEST-OPENBAO-16188458
- published24 Apr 2026
- disclosed21 Apr 2026
Introduced: 21 Apr 2026
NewCVE-2026-40264 (opens in a new tab)How to fix?
Upgrade Chainguard openbao to version 2.5.3-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openbao package and not the openbao package as distributed by Chainguard.
See How to fix? for Chainguard relevant fixed versions and status.
OpenBao is an open source identity-based secrets management system. OpenBao's namespaces provide multi-tenant separation. Prior to version 2.5.3, a tenant who leaks token accessors can have their token revoked or renewed by a privileged administrator in another tenant. This is addressed in v2.5.3.