CVE-2026-42186: OpenBao's Namespace Deletion May Not Delete Data Properly

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-14 · updated 2026-06-17
Weakness: CWE-212

Description

OpenBao is an open source identity-based secrets management system. Prior to 2.5.3, when OpenBao's initial namespace deletion fails, subsequent retries fail to properly remove all data before marking the namespace as deleted. This can affect any outstanding leases as well as potentially leaving unrelated storage entries around. This vulnerability is fixed in 2.5.3.

Affected products

openbao: before 2.5.3 — fixed in 2.5.3

How to fix

Upgrade to a fixed version: openbao 2.5.3. Check the vendor advisory for mitigations.

References

https://github.com/openbao/openbao/commit/6d2e0506e2b41be0eaa6643bf7b4efc9a2c09445
https://github.com/openbao/openbao/releases/tag/v2.5.3
https://github.com/openbao/openbao/security/advisories/GHSA-vv66-6rp4-wr4f

Get alerted when CVE-2026-42186 or the next vulnerability affects your stack