Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M

CVE-2026-40264OpenBao's Token Store Allows Cross-Namespace Renewal, Revocation

Low 2.0

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 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)2.0Low

Exploit odds (30 days)0.3%top 77.0% 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. 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Alpine:v3.23	openbao	2.5.4-r0	ALPINE-CVE-2026-40264
Alpine:v3.24	openbao	2.5.4-r0	ALPINE-CVE-2026-40264
Go	github.com/openbao/openbao	0.0.0-20260420162526-f58111d2ca54	GHSA-p49j-v9wc-wg57
Go	github.com/openbao/openbao	0.0.0-20260420162526-f58111d2ca54	GO-2026-5526

Affected products (as reported)

Vendor	Product	Versions
openbao	openbao	< 2.5.3

Weakness: CWE-1259 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References

https://github.com/openbao/openbao/security/advisories/GHSA-p49j-v9wc-wg57 x_refsource_CONFIRM